The way I read it, it looks like OP is saying that in case Google pulls out, then it will likely not continue.
And I tend to agree with this. I can foresee an initial counter-push for the first year or so after google pulls out, but then the project will die its own death.
However, with Flutter specifically, I have a strong feeling that Google won't pull out. Esp given how Dart was kind of a big flop for years after the initial release, and Google still kept it around until Flutter came into existence, and then made a hard push to continue with Dart. At the moment, Dart is the best and most popular it has ever been.
