What happened to emberjs? It was poised to become the next big thing after react and angular and suddenly nobody talks about it anymore.
It didn't go anywhere. Vue.js just became more popular for whatever reason.
It was a hulking, omakase, MVC? based framework at a time when the oppo was Angular 2.0 & Backbone.js and people still used Bower, then React threw everything on its head in favor of component libraries while NPM came into the mix.
They eventually refactored in components and I think repackaged everything for the new js fe ecosystem, but the battle was already lost.