I think Stadia being shut down is a near certainty (and the GP comments' 3-4 years is very optimistic for how long it might survive), but I think that Stadia ow

I think Stadia being shut down is a near certainty (and the GP comments' 3-4 years is very optimistic for how long it might survive), but I think that Stadia owners losing their games is fairly unlikely. When other digital services with purchases have shut down, there's often some attempt to offer a migration for user licenses. (I've watched Ultraviolet and Flixster's shutdowns and the like of late.) The game studios partnering with Google would be extremely upset for their customers to be dropped, and I'd especially expect games like Destiny 2 to cleanly migrate a user's data and progress to playing on another platform. Even when Google shut down their Assassin's Creed demo of Stadia's technology, which was free, they gave everyone a game key to redeem on Steam at the end, so my guess is that's what would happen in a Stadia shutdown. The most likely "loss" is from the hardware purchases, though Google has hedged here a bit on the fact that a Chromecast Ultra will still be useful post-Stadia. Even the controller might not go to waste if it works as a generic PC game controller.