Company where I currently work, feels pretty happy about using AngularJS 1.x. We aware of Angular 2 and very glad to see changes (especially Rendering Architecture). We know there will be migration path, but it's not so important - projects, which works good with 1.x, will remain on 1.x branch, and this branch will be supported long time enough. When Angular 2 will be released, we are going to try it in new apps. We are playing with ng2 in sandboxes like https://github.com/pkozlowski-opensource/ng2-play and changes are not as dramatic as most people thinks. Well, maybe forms and 2-way binding, but everything else just got more modern API mostly.

Why? React isn't a full framework and solves a completely different problem.

Yes, it isn't backwards compatible, but you can use AngularJS 2 side by side with Angular 1.X. There were migration paths presented at NG Japan.