I'm concerned about how this will work for game libraries. If I buy a console and maintain the hardware, I can still play all the cartridge / CD games I bought

I'm concerned about how this will work for game libraries. If I buy a console and maintain the hardware, I can still play all the cartridge / CD games I bought for it forever, indefinitely. The hardware target does not change. Google has a track record with their cloud infrastructure (such as App Engine) of requiring developers to keep updated as the engine changes. Will they attempt a similar model with the system against which Stadia games are built? And if a given developer doesn't want to invest the roll-forward effort (or dies out), does Google maintain an older version of their infrastructure indefinitely to run no-longer-updated-by-developer games, or do they pull those games from their offering to free up resources to run newer and more popular games? This seems a bad investment for a gamer who is interested in returning to a beloved treasure 5-10 years out. Even my old Steam purchases can be re-installed and run on my own new hardware.