The happy ending is that megacorps stop screwing around and start obeying the laws, like everyone else.

In your fantasy scenario you didn't consider that the current version(s) of Android running on billions of devices are mostly open source, and there's nothing preventing Samsung, or Samsung + Sony + whoever to take that, combine it with one of the other existing app store and GApps replacement apps (Firefox, some maps e.g. Nokia, etc) and continuing like nothing happened. What are the Android app developers going to do, say "oh well" and settle for their market share shrinking to almost nothing which is what the Pixel amounts to? No, they will publish on the new Samsung app store.

And life moves on. Perhaps Jolla gets a boost, or we see a new or old player try something new.