I just have the "feeling" that with Discourse being written in EmberJS, people are mindlessly going to flock to it without really looking at anything else.
And even if AngularJS really is better, it will be left behind. Just because...
It's maintained by Google, but it's from Angular company (an online JSON storage service). The 'by Google' in it's name doesn't mean it's designedto be 'Google's JavaScript MVC' and I know Google employees who think expressly otherwise.
Yes, but I'm afraid it might go the RoR way. Rails started off by disrupting the web-dev space and positioning itself as an alternative to Java. It really pushed the overall web-dev space forward.
However, today, I feel, Python is more popular than Ruby (at least in my part of the world) because of various other reasons. Even though a lot of web frameworks are doing things the Rails way.
And even if AngularJS really is better, it will be left behind. Just because...