You misunderstand. This isn't a BC issue. XBO games are reliant on MS servers to function - once those shut off 10-15 years from now, those games become glorified drink coasters. The same cannot be said of current-gen games. Plug in your PS3 and you can play your PS3 games, even 50 years from now. The same cannot be said of XBO.
An all digital future is bad enough, but at least theoretically, you should've been able to play the games you bought and downloaded for as long as your machine works. But now add in mandatory server checks and suddenly EVERY game is dependent on those servers staying up.
I'm not comfortable with my games having an unknown expiration date