> More specifically: the end of Javascript, HTML, and CSS.

The opposite is happening, JS/HTML/CSS are becoming the standard for desktop apps rather than something else replacing them on the web.

> But, browsers have more or less completed their transition away from being some kind of "document" viewer and into being a fully-fledged execution environment and rendering system. WASM lets you run stuff fast. There are already libraries for languages like Go and Rust that purport to let you compile your app to desktop, mobile, and WASM. Truly one codebase.

We don't need WASM for this, we already have things like Electron, React Native, and Flutter.