Though you have a physical copy of the game, I don't discount a future where a console refuses to load a physical copy of the game because DRM impedes it. Much like when short-lived TLS certificates expire on their own, even by being offline.

Physical copies of games have in their EULA that the game is licensed to you, so theoretically they could still disable it.

Precedent? BlackBerry phones refused to connect to WiFi if you didn't pay for your mobile data plan. It became a 2G brick.

Actually, thinking about this now, I tried to play PS1 games on my PSP about two years ago, but couldn't because they needed to be (re-)authenticated.

Sadly, there's NO way to authenticate PS1/PSP games on PSP anymore. Even connecting it to the PS3 via USB and trying to authenticate it didn't work.

(At least PS1 games still work on PS3 for now, though.)