Hmm I tried gaming on a laptop (i7-8550U, 802.11ac) using Steam where the gaming happened on my Gigabit connected high-end desktop. It was playable but the video compression artifacts made an 11 year old game look pretty terrible (in comparison to playing it natively). So I can't imagine anyone would prefer that if the pricing on good hardware is within reason.

I have not tried Stadia so I cannot compare that to how this Steam streaming works, but it would have to be 100x better.