Any confidence I have in the continued existence of Google Ads comes from Google Ads persisting for several years already. That confers approximately zero confidence to Stadia. Stadia is new to Google, and that list shows that things new to Google are very likely to be cancelled. If Stadia hangs on for 20 years, then expectations will be adjusted, but that hasn't happened so it's foolish to expect it.
Here, there is none.