There are two things to consider;

1. Version numbers are not that much of an indication to stability. RN is much more battle-tested. 2. Udacity and AirBnB both have been using React Native in a "use the bad parts" fashion. (Specifically, they have been using it with an existing app instead of from scratch). It is not really fair to React Native to be honest. However one thing from Udacity is quite fair, RN is much worse on Android in comparison to iOS.

I think giving it a try and having something new in your toolset is a nice idea. However, I doubt Flutter will be "RN is dead long live the new RN".

Finally, I really don't trust Google not to axe this project too on a spite. However that might be more personal so keep it out of the equation.