I'd be careful with predictions wrt JavaScript frameworks. Though I personally like React, just two or three years ago Angular was the framework of choice for many (I've never been a fan of it). Front end framework churn seems inherently cyclic in nature, where a new minor generation breaks with tools of the slightly older generation to define itself on the marketplace.

Moreover, it must be said that neither React nor Angular are front end libraries in itself; they merely organize DOM manipulation and event handling in a more or less bureaucratic way.