In principle I like this approach but there are advantages with going with the larger frameworks too. For example, if I build something with Angular, I can take advantage of all the components, tutorials, SO posts etc that the community has generated. If I roll my own solution from a handpicked collection of third-party libraries I forfeit all that. I was until very recently leaning towards using Angular but now that they've announced that Angular 2.0 is practically a rewrite that also seems like a dead end.

At the moment I'm rooting for Polymer/Web Components, even though I'm not sure I'm on board with all their design decisions, if only because it seems to be likely to generate enough consensus to be a stable platform to build on for the next several years. But even that isn't something I can actually use today to get work done.