If you look at the sheer number of requests to fetch some JS from some random website happen when loading a modern web page this will not be possible. Web pages

If you look at the sheer number of requests to fetch some JS from some random website happen when loading a modern web page this will not be possible. Web pages rendering depend on JS being pulled from many places, and often not under the dev's control. So we'll end up with a mix of JS and WASM whether we like it or not.