Xamarin and Appcelerator are suggested as more stable, and likely long-lived competitors. They might be more stable, but apart from “acquired by …” and “got … in funding” no arguments are made why they will exist (and be maintained) longer.
So, I don’t know. I’m still interested in ClojureScript, which allows/inspires libraries like Om, and can be used with React Native. And I definitely don’t buy the “let’s write this in Swift instead” angle.