This is such a dull take at this point.
I'm sorry, but WASM won't magically be able to port your UI app to the web. Just because it can convert some basic logic doesn't mean that it will be able to create a performant application that uses the underlying browser APIs correctly.
Lets say there was some sort of framework that did this in your language of choice, there's still significant downsides in terms of interop with the rest of the JS ecosystem and debugging.
I'm not yet totally convinced. There are no WASM apps that handle full unicode, with CJK input, right to left input, etc.... that I know of. I'm not looking forward to every wasm app having it's own quirks that are vastly different than the quirks of my OS.
This is exactly where it's going. You are right
The Birth & Death of JavaScript
https://www.destroyallsoftware.com/talks/the-birth-and-death...
Everyone wants to reuse their web app on the desktop, but soon it could flip the other way around if you can suddenly run your native app in a browser