Looking at the example source code & having experience of AngularJs & TS, I would say this is a huge development in term of enterprise adoption.<p>Statically typed, annotations, built-in dependency injection, comprehensive test support (easy to write testable code), declarative UIs, 100s of already available libraries & above all support from Google and Microsoft. I can say this with confidence that even with a complete rewrite & not backward compatible, AngularJS 2 with TS is going to be a huge success for everyone.<p>And sooner or later, all other frameworks will adopt ECMA Script 6 because of standardisation of so many things (modules, classes etc.)<p>I would also like to add that this is a very exciting time for JavaScript developers because there are so many things happening & companies of all sizes will keep investing good amount of money moderating their JS code bases.