Re: What's your prediction on the Australian Dollar?
	
		
	
	
		
		
			And how many of them [RSPs] will fail to be competitive and go bust,
		
		
	 
Probably about as many as have failed to be competitive and gone bust under the current regime, which is structurally similar (in fact worse, due to anti-competitive practices) for most of the smaller players who buy wholesale ADSL access from Telstra.
	
		
	
	
		
		
			leaving their customers stranded without telephone or internet?
		
		
	 
Seriously? As has been happening for the last 15 years, if a RSP (ISP in non-NBN lingo) goes bust there will be others who want to buy their customers base and continue providing service (especially fire-sale conditions if said RSP has gone bust). And even if that somehow didn't happen, you'd be talking about a couple of days downtime, tops, for those customers to switch to another RSP of their own accord.
	
		
	
	
		
		
			The NBN will be used for entertainment, mostly.
		
		
	 
You  may possibly be right in terms of volume of traffic (I really don't  know), but you're completely and utterly wrong in terms of the benefits (economic, social, etc) that will flow out of it. 
The NBN isn't being built so people can download  movies faster - if you think it is, I'm not surprised that you're  against it, but you're also forming that opinion based on incorrect  fundamentals. You (genuinely) should go back and educate yourself about  the benefits of ubiquitous and fast broadband - both what it delivers  now, and what social and economic (and so on) benefits increased availability and  speed of internet access have delivered historically. You might change your  mind...
	
		
	
	
		
		
			Paying for it will be a massive headache
		
		
	 
This  argument has been done to death, and based on currently known facts and  best available estimates is most likely wrong. Even if you ignore 
any and all social,  economic (etc) benefits beyond pure cost and direct revenue generated,  the NBN is an investment which is budgeted to not just pay for itself,  but also make an return on the money invested. 
I'm sure your  natural insta-response will be something along the lines of "but it's  going to cost [insert far larger than budgeted figure here] and be a  financial disaster". This 
could turn out to be true - no one can predict the future. But it's 
not  the assumption most supported by known facts, reasonable estimates and  logic at the present time, which makes it the rational-argument  equivalent of sticking your fingers in your ears and yelling "la la la  it's going to cost a fortune I can't hear you la la la".
	
		
	
	
		
		
			and there's every chance it will be obsolete before it's finished.
		
		
	 
And this argument is just 100% flat-out wrong. Incorrect, not  supportable, wrongsies. Even the politics-driven (i.e. they can't  support it cause it's not their policy) Libs have given up on this one  as a reason to object to the NBN.
Fibre-optic cable has been 
the  way to transmit data at high speed for the better part of 40 years.  There is no technology, currently available or even [realistically]  proposed, that offers a better alternative. There isn't even anything  that comes close. Yes, I guess it's somewhere within the realm of  possibility that sometime over the next seven years some entirely new,  never before-thought-of better way of transmitting data will be discovered and  commercialised, but we're talking about such an incredibly minute chance  that it's not even worth considering, and to base policy /  infrastructure decisions on that chance would be utter idiocy.
	
		
	
	
		
		
			The NBN is the costliest high speed broadband  project in the world on a per capita basis by a long way. Now sure  Australia is a big country and rollout will be dearer...
		
		
	 
You've  just pointed out exactly why this is a silly argument. Australia also  has one of the most geographically dispersed populations on Earth -  many, many orders of magnitude more so than any other country  implementing a remotely similar broadband infrastructure project. 
Absolutely  this makes the NBN more expensive, but if we're going to undertake a  project like this in Australia it's also a fact of life, not a failing  of industry or government or competition or whatever.
	
		
	
	
		
		
			Are you actually critiscising the NBN. Google is  rolling their system out faster and at less cost than the NBN.
		
		
	 
See above, once again - the economics of rolling out fibre to single,  densely populated cities vs 93% of the population of a country the size  (and low population density) of Australia are completely and utterly  different. Actually, when taking these fundamental differences into account, it  really makes Google's fibre look very expensive (or the NBN's very  cheap, depending on which way you want to look at it).
	
		
	
	
		
		
			Its also interesting that nearly every  advanced economy has had its telecommunication industry privatized with  many competing private companies risking their own shareholder value in  competition with each other and using a variety of different  technologies.
		
		
	 
Point out just one other country that has a  similar geographical size and population density to Australia where  privately owned fixed-line telecommunications competition is working on a  national scale, and you can make this argument - otherwise it's just a red  herring (I'll give you a hint: there aren't any). 
Not to  mention, we've already tried this path for the last 15 years, and it's  completely failed. We don't have the infrastructure-based competition  you're suggesting we should have because it's not economically viable here, and what little competition we do have  has been eked out only by successive governments - Labor 
and Liberal  - dragging a kicking and screaming Telstra along against its will. It's  been a disaster, and a massive failure of competition policy (an almost  universally recognised one, too). 
	
		
	
	
		
		
			Two questions. Whom do these retailers buy  access and capacity from? What other alternative providers will there  be?
Unless I am mistaken - they all will have to buy access and bandwidth from the NBN.
		
		
	 
You are not mistaken - that's exactly how it will be. And even as a pro-NBN person, I agree that it's not ideal. 
But,  we simply have no other choice - as per above, fixed-line telecommunications in (most  of) Australia is a natural monopoly, as there just isn't the market  size or population density to make true infrastructure-based commercial  competition economically viable. So one way or another we're going to  end up with a monopoly, and in that case a government-owned monopoly is  far more palatable option that a privately-owned one.
The last 15  years under Telstra are really the proof-in-point here - it's been an  utter failure. Even most anti-NBN pundits, the Liberal party, etc,  recognise this, even if they don't agree with the current government's  "solution".
	
		
	
	
		
		
			Or put it another way.  Hypothetical - "the  government recently announces a ban on commerical arlines flying from  Sydney to Melbourne, only Qantas is allowed to fly this route, but you  can buy a ticket SYD-MEL from any travel agent in australia that you  want. Whichever you choose you will end up on the exact same Qantas  aircraft."
		
		
	 
Completely false comparison - partly  because commercial competition is economically viable SYD-MEL, and  partly because the comparison you've tried to draw is more akin to the  current Telstra-monopoly (via market forces rather than government imposition) than the new NBN-monopoly.
It's ironic you've chosen this example, actually, given the  situation on very low traffic air routes, where the government actually 
does restrict the available carriers and seats to ensure the route is economically viable (and hence gets serviced).