The main mistake, in my opinion, that Angular 2.0 is making is removing two-way data binding. The whole cornerstone of my love for Angular was the idea that wherever data was updated (view, model, server, another user's browser, etc.) it was trivial to make that update appear everywhere else. This is even more powerful when you add in a technology like WebRTC data channels or websockets.

I could just bind the data to the view, and if the user changed it, I could react accordingly. Data changing became an actual event that I could subscribe to. It abstracted away the onkeydown, onkeyup, onclick, etc. so that it just became ng-change. So much less mental noise when I'm developing when all I have to do is react to data having changed.

I hope this gets picked up. ES6 and TypeScript have so much to offer, but without a data-centric paradigm, I find I'm just not interested anymore.