I've been wondering the same, but also trying to understand the impact of DOM access in WebAssembly. This might create a massive fragmentation problem for web platform code and I am not sure the benefit. ObjC -> Swift worked. Java -> Kotlin might work for Android, though still somewhat annoying.

I don't know what the future of communicating web code with snippets would be like if everyone chose their own language. I am not a web developer, but is this happening with TypeScript now? Is it a problem?

EDIT: I am pro-WebAssembly, but I am starting to think the benefits are actually about taking the philosophy of the web outside the browser and leave DOM-based pages to html/css/js