One of my favorite things about Ember is how we've incubated a community that tries not to get too "high on its own supply."
We've borrowed ideas liberally from Backbone and Angular when we saw how those ideas benefitted developers working on large apps. Now we have the opportunity to improve our view layer based on the pioneering work of React.js, while maintaining the edge that being used in hundreds of large-scale, production apps gives us.
Ultimately, I believe Ember's biggest strength—a sort of meta-strength—is the willingness of the community to abandon old ideas when a new, better idea comes along. At the same time, there's a tendency to be skeptical and really understand the idea, to make sure there's some "there" there, and not just chasing the latest hype.