> It can take years to be an overnight success but they seem to have lost that vision.

Per other commenters on HN over the years, the Goog has a culture where you can only get promoted if you launch a product. If that is true, then the point of Stadia wasn't success for Big-G, it was a promotion (or a set of them) for some people. Retiring Stadia quickly then makes sense, as it saves money to get rid of the promotion vehicle quickly.