Knowing that we'll be able to slowly move our app to Angular 2, one feature at a time, is certainly the best news I've had in a while.
The first guy I heard talking about it was like "It was made by an underdog at google" and "We often had the feeling about hitting a dead end when developing with it, but it was always because we were using it wrong" which both sounded strange to me.
I used ExtJS, Ember and React. And never switched away from them because it wasn't maintained anymore. It just happened that people preferred to use new frameworks on new projects.
Last December I coded up just enough of an app in Angular to ensure that my Sencha-focused Flask app would work with another JS framework should the need ever arise. I'd hate to have to go that route of course (even if Sencha changes hands), but it's nice to have options.
At the end of the day, when you're writing commercial software in a big team you are inevitably going to have to join up technologies whether you or angular likes it or not. Angular 1 decided to make this a PITA, so I can't ultimately recommend it for use. I haven't looked into Angular 2 though.
And given javascript is still way behind the other languages at the moment, javascript libraries still have a lot of settling down to do.
For example, one of the big problem with javascript was specifically that there was no way to watch for property changes, so all sorts of crazy strategies were adopted, like getters and setters as methods, or scanning all registered objects for changes. But they all suck and force you to write crappy code. As new ES features are adopted, less of these dirty hacks are needed but they cause major changes in libraries.