Given Microsoft's ownership of Github, I suspect it's inevitable. If anything, I'm surprised that it hasn't already happened.
You will only get bad press. Much easier to let it rot.
2. Bad product management / development speed seems to be the case here, not rot or killing, as it seems it's actually not stuck on Python 2 anymore, or for long [1]
3. Even if neither of the two things above were true, I have seen no bad press on GCP due to this, and I'm a heavy GCP user, though just not in this niche. I've used Python cloud functions as well as GAE though.
[1] https://cloud.google.com/appengine/docs/standard/python3