Compute Engine also isn't really in the same realm of worry as App Engine, for some, at least. Most of what you're getting is immediately migrateable if it's going to be shut down, as opposed to app engine, where there are some migration paths to similar stacks, but no flip-a-switch path to converting existing code and data to a "standard" stack (at least from my understanding. I haven't tried compute engine).
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it looks like you get one year from announcement of deprecation: https://developers.google.com/compute/docs/terms (see 7.3)
Compute Engine also isn't really in the same realm of worry as App Engine, for some, at least. Most of what you're getting is immediately migrateable if it's going to be shut down, as opposed to app engine, where there are some migration paths to similar stacks, but no flip-a-switch path to converting existing code and data to a "standard" stack (at least from my understanding. I haven't tried compute engine).