.NET + Angular is becoming the most popular way to develop webapps. .NET is used for the backend, Angular for the front-end. In my experience as a project manager, the Angular part ends up being slow and expensive to develop. If Wt.NET is as easy as regular Wt, then you have a market.
Unfortunately, my company does not invest in such research projects unless we do it internally. The fact that the C++-to-Java source-to-source translator is not available does not help either :-(
Your request is noted. If we see this request a lot, Wt.NET may happen... Please understand that this must be economically senisble for us, since creating, documenting and maintaining such a port is not a small task.