This is a cloud service. I'd imagine they will be much less likely to kill these services outright. The impact on paying customers would just be too large. That's not to say they won't sunset certain features though.
The impact of killing Google Checkout for customers using it was probably minimal, since nobody was using Google Checkout (hence the reason Google killed it.)
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.
