Stadia is dead because if you have a data-center of GPUs you are using them for AI. It has nothing to do with input lag and graphics degradation.
stadia died way beforehand, history is useful
https://www.denofgeek.com/games/why-google-stadia-failed-shu...
Oh no my guy, you are misremembering, stadia died a quiet death long before AI.
The latency was no good even on fast internet for even slow games. It is and was pointless.