In terms of community, richness, maturity of the ecosystem, features, flexibility, and cross-platform capabilities, React is the stand-out choice.
The one thing that Vue.js may have over React right now is the learning curve. In a year or two, however, we may see Vue.js overtake React in all the other factors. If not, another framework/library probably will.
Angular is unlikely to disappear altogether, as there are enough early-adaptors and hard-core advocates of Angular remaining, meaning that we'll still see Angular on the market for at least a few more years. But unless they do something drastically different (and better), it's safe to assume Angular will fade slowly into the background, just as its predecessors have done before ...
