Main thing that would prevent me investing in this stack is that the runtime has been designed with typescript in mind. In a few years if the typescript thing blows over, you're left with a runtime and conventions skewed toward statically-typed programming patterns.
As someone who works with TypeScript extensively, TypeScript patterns are basically Javascript patterns - although perhaps with slightly fewer runtime type checks.
I used to dislike typescript, until I was hired to write it. It has warts, but the benefits outweigh them, and you aren't forced to use the parts you may not find beneficial. I think it's a good way to prototype a typed version of javascript, at the least.
