[tragic]

I missed the word 'this' in the GP, so this is fair enough.

Even if we're just talking about Backbone, however, it's a little off: I mean, people use react with the non-view parts of Backbone. Often you're going to need some way to talk to APIs (say), and Backbone gives you a cheap and well-known solution for that. I'm no Backbone fanboy, but significant things have been achieved with it, and they are not now suddenly impossible because there's a new view layer on the scene.