Vue and React both seem a little too heavy in boilerplate. It's also interesting that Vue seems to think that mutable state is a good thing (well, vanilla React does have mutable state too...).

For the boilerplate (and large bundle size!) problem we have http://markojs.com that looks very interesting.

However, I think what we really might want is something closer to ClojureScript's re-frame (https://github.com/Day8/re-frame) and Reagent. However, Clojure and it's tools aren't really that great for beginners/juniors and/or people with little experience in FP and lisps.

Maybe in the near future we'll see a little bit more FP style JS solutions pop up?