? future proof the NBN. Now where have i heard it before?. The computer industry is always trying to upsell the specs on the latest laptops. That is the biggest marketing bulldust around. There is no such thing as future proofing in the technology world.
If you take the term literally, maybe.
But if you take it as intended, which is "build in enough scalability to handle reasonable future growth based on known trends and where possible don't engineer yourself into a corner" then it's quite doable.
Think of it like this. While you might only build a four lane motorway today, but you know your urban growth plan will mean an eight lane one will be necessary in fifty years, you reserve enough land from the get-go for (at least) eight lanes. Because it's horrifically expensive to go back and resume land decades down the track.
I have not yet heard an argument for internet speeds faster than 25Mbits/sec for residential customers
If there's an argument for 25Mbit to handle Spotify, Netflix and cough, there's an argument for 1Gbit to handle Spotify, Netflix and cough, because it's the same argument.
If there's no argument for enough bandwidth to handle luxury goods like Spotify, Netflix and cough, then there's not really much of an argument for anything more than 256k ADSL. That'll cough all over any sort of internet usage that could reasonably considered a critical necessity, like banking, paying rates, etc.
I say BYO - "build as you go"
So, let's say you and your wife know you're going to have three kids over five years, but you're not planning on having the first one for a year. Do you buy a two bedroom flat today or a four bedroom house ?