Earlier quoted context omitted.
If I could play high-end complex modern AAA games like RDR2 on my iPad Pro while traveling, I think there's a valuable proposition there. But ironically that's exactly the area where Stadia falls flat: internet connections are weak or nonexistent while traveling, and currently it's not even usable from an iPad.
This is the thing I don't get. Who precisely is this concept even marketable to? People with high speed internet, that also can't afford a gaming console? But can afford a device capable of handling all of the inputs & playback of the video. So lets low ball and say a $140 chromebook. + the cost of the games. How many people is this? Genuinely.
For example, a gamer playing on PC and/or XBox might want to play Horizon Zero Dawn for some time, but not buy a PS4 just for one game. Or some Nintendo exclusive game.
Most people don't have all gaming consoles available, and exclusives are (IMHO sadly) a thing, and this might be a reasonable workaround to provide compatibility.