In theory it all seems nice and good, like pretty much every technology out there, but tell me the last time you saw something escaping the grasp of greedy companies and their antics.
Just some of the possible unfortunate consequences of digital-only distribution:
1 - always online gameplay
2 - limited lifespan for games
3 - paying extras for unlocking content
4 - in-game advertising
5 - account hacking
6 - killswitch in case of mods or cheats
7 - one copy per player is mandatory
Also they could shut down your entire library if they feel you step too much out of the line, like M$ did with some X360s a while ago. And so on.