I've had this debate with a friend who's a big proponent of EmberJS (and to a lesser degree Angular). My friend feels that without one of these libraries you will simply be writing way too much unnecessary boilerplate code for a single-page app of significant size. I personally prefer to rely on small modular dependencies, so Component appeals to me, but I've only played with Ember/Angular a little bit so I don't necessarily know what I'm missing. Can you recommend a set of Components that would provide similar functionality and productivity?
So what we have so far from these 3 libraries is basically a decomposed backbone with declarative bindings. That will cover 99% of your typical app. I don't find there is too much boilerplate.
Take a look at the Ember examples at http://emberjs.com/. They're doing a lot more with a lot less code. Backbone had its day, but the world is moving on, and a new project that only offers Backbone-equivalent functionality won't garner much interest from me or probably anyone.