Imho the thing that killed stadia was the pricing model. Buying games but not owning them outright* is a recipe for failure, especially for a company known for killing off services (and I say that as a xoogler with very mixed feelings). Stadia should have just had a monthly subscription fee.

*Yes, with DRM, copy protection, online only, etc, it's debatable whether anyone owns any game. But conventional game ownership or even steam style is still _more_ ownership than the stadia case.