Well, I feel bad for this anthropomorphized Stadia, but the actual product itself is a solution looking for a problem. If internet speeds and reliability increased enough to make Stadia tenable, why not just download the game faster in the first place, and not worry about lag, buffering, and lower quality due to connectivity issues.
Plus the ability to play offline during internet outages for many games. Then there's the fact that if games did every go fully streaming, then you could kiss real ownership, mods, cheats, player-made patches that fix problems that the real game devs just don't care about (I.E. Bethesda, Square) or add features that should've been there in the first place, etc.