This looks awesome, but I would be hesitant to try it since you can't know if Google will keep the service alive a few years from now.
I am excited and will gladly try it on some side projects.
Cloud services on the other hand, killing those would be highly disruptive and would probably effectively kill any products built on top of them. It's hard to imagine Google killing any of these services, unless one of them say is wildly unpopular and only a small handful of people will be outraged if it is killed. Even then, it's seems insane to think about Google shutting off database or computing services people are using to run businesses.