For learning purposes, I would advise sticking with React. Being more mature, you'll likely be able to find answers to your questions more easily. Pluralsight, for example, has lots of great courses on React but none on Inferno. Knowledge will be highly portable between the two so if you find a need to switch over to Inferno at some point you won't have any trouble.

No. But the good news is that Inferno is extremely API-compatible with React (deliberately so, and has an inferno-compat package to help further) so should it stick around and continue to be this much more performant than React, switching should be relatively easy.

Yes, because in a few months it will be topping the HN headlines on how everyone is porting their applications to it.

I think that seems unlikely, if only for the fact that React has a path for developing native apps. Writing shared business logic in Redux and allowing both DOM and RN seems like a slam dunk to me.

I was being sarcastic.

In any case RN isn't something I would ever use, given the choice for writing native applications.

Yep. It's an unfortunate that Inferno is not for native app. If it did, I would switch in a heart beat.

No, stick with React.

JS Frameworks become obsolete within a year (2 years at most) so you should learn what you like most. The community and documentation available should be a big plus.

React was first released in 2013 and I don't see it disappearing any time soon.

Released, but it didn't get popular until recently, definitely less than 2 years ago.

I personally think people will start switching to Polymer en masse when Google is done rebuilding YouTube with Polymer.

In the GP's defense, that's what we thought about Angular two years ago.

Angular is still around.

Which Angular? Is Angular 2 really the same framework?

I think you make a good point. I personally don't care much about Angular and I don't see myself ever using it. But it is still in heavy use, which was the only point I was attempting to make.