Ask HN: Will JavaScript take over front-end?

I am seeing unbelievable amount of blog posts, releases, upgrades about Javascript frameworks and libraries during the last 12 months. I personally only used AngularJS 1.x for one of our projects, but did not have time to try React, or AngularJS 2.x. My conclusion for Angular is that it takes 40% more development time to finish a project with AngularJS than without using it. We gained some speed for sure, but I think we could do better in the same amount of time with back-end optimisations. - How was your experience with React or any other? - Should I invest more time to keep me updated with one of them? - I still think, front-end should just present the information, not the whole application logic. Am I missing anything? (I just discovered polymer-project and loving it so far!)