I don't get this attitude towards commercial Google products. You are a paying customer that is very likely to use other Google cloud services. It would be stupid to annoy a large subset of the paying customers by not providing a clear roadmap of sunsetting. And Google stupid is not.
I am excited and will gladly try it on some side projects.
You may have missed when they jacked up AppEngine prices. It was fine for a lot of people already making significant money with their app but it basically killed my app (would have been unjustifiably expensive to keep running). I won't be trying proprietary google infrastructure again anytime soon.
A clear sunsetting roadmap still means that you trusted your business to something Google no longer cares about. It doesn't protect you from the cost of migration.
I am excited and will gladly try it on some side projects.