[Jgrubb]

xtrumanx said it well. What you learn while picking up any one of these newer frameworks will serve you well.

3 months ago I'd never touched any of them, at least not successfully. Then I got a project to build an app-like mobile website for my company on top of Drupal. I spent a few days trying to figure out how to fake it with jQuery and prefetching, all the while knowing that one of these frameworks was the better way to go. I spent a morning spinning up a couple of JSON feeds in Drupal and the afternoon learning enough Angular to get something to show up on the page, and I think it's fair to say that in the 2 months since that day my developmental worldview (and my productivity) has shifted considerably.

Regardless of how long Angular sticks around (though I suspect it'll be a little while), what I've learned from working with it nonstop for the last 2 months has definitely made me a better developer overall.