Ironically if Google will indeed switch to Fuchsia or another in-house OS, Android may survive in some form as their biggest competitor.
I'm curious how long Google!Android will be supported once Fuschia launches. Maybe 2-3 years, and it depends on how many existing Android devices can move to Fuschia.
Android's strength over Windows Phone was the app ecosystem and I don't think an emulator will instantly be good enough to emulate all kinds of apps with sufficient performance, especially games.
Disclaimer: I work at google, but in an unrelated department, and have no inside knowledge / reads about what is going on with fuscia, and so my opinions aren’t more insightful than any other random engineer on the internet.