You can still buy the Skybus tix online, as on laptop, if you are app less.
I did the app, have it on my smartphone, easy set up, but I thought it would have a discount.
But not so, still pricey for a one way.
Also, while the app makes it easy for them, not sure how it relates to earning points in the Skybus system.
Much better than being in the queue at Tulla.
Edit: ah, so no airport tix selling for Skybus now, onsite, ta for that one.
+++
In the next 30 years? I have no doubt MEL AP will fight it and find any excuse to prevent it.
Re: Melbourne Airport train serivce, like SYD, its coming though, and there will be an airport surcharge for that service.
Not to mention, MEL airport rail link will be a public service, so your ride will be a normal train.
Not sure if it will have specific baggage zones, and if its an end of line service like BNE.
Imagine, it might will be like SYD.