I think undoubtedly, I would bet on the longevity of a streaming service from Valve or Amazon more than I would one from Google. But Google's past history of killing free side services doesn't offer the most relevant precedence. This is a service into a mainstream (and growing) industry that gels with Google's strengths, particularly scalability and AI. YouTube Premium/TV would be better precedent, though the jury is still out on those. I think there's still a difference, though, in that YT+/TV entered a market with already dominant leaders (traditional cable, Netflix, free YouTube). If Stadia can satisfactorily mitigate the problems inherent to streaming, and get it out before Microsoft's rumored Xbox development, it will be in a prominent position in a new field for gaming.