Regarding the Google Cementery, I have a different perspective. Most projects (if not all) failed to reach the number of users that Google needed to keep them alive. Most of them (if not all) were free so if there is not enough traffic, the'd be bleeding money. Some services were integrated somewhere else or became something different. For example, I was a big fan of Buzz (later became Circles) and Wave (many features belong to Google docs now). I miss some of that stuff but I can see them not making enough money to survive.
Personally I rather have them release services and kill them if they don't pick up than not ever seeing them at all.
That said, I'd be surprised if Stadia actually becomes a success in it's current form and because it's not making money it's very likely that it will be enventually closed. The only way they could gather some support is if they partner with Steam or someone else so keys are still valid if the Stadia service goes under. I'm not purchasing any game that is exclusive to a platform that might not exist in a few years.
At least with consoles you have the option to get a second hand console and keep playing. Without an alternative, spending money on Stadia is just stupid.