They can still 'be around forever'. There's nothing stopping devs from releasing digitally anymore instead of limited runs or cutting off supply when things aren't selling.
They can? We have strict DRM, completely unknown future around whether or not we can carry our games to new hardware (are all my PSN games playable on PS4? who knows....), Sony set publishing and licensing fees on the platform (even for patches due to bandwidth). Sony control and run the whole network and if you don't like their digital policies and/or can't afford to pay them what they tell you, tough luck. You do not have that issue, at least to that extent, on a PC.
Konami wouldn't even release an Xbox 360 patch for Silent Hill HD saying MS charge too much.
My point is sure FIFA/COD will be there day 1 digitally, but the PC market is absolutely light years ahead of consoles for allowing developers (especially indie) to distribute their games and updates as they see fit (DRM free, through torrents, for whatever price they want, ect).
Consoles are closed platforms, and as long as they remain that are consoles, if they ever become open they essentially become a PC under your TV.
The other stuff you mentioned is on a completely different track.