I mean, it’s another tool. It doesn’t really make an entirely new kind of web app possible, but it’s useful for some specific compute-heavy tasks (with limitations like JS<->WASM being slow). It’s also useful for running not-JS in the browser; I’m building a lighting console with a web UI distributed over multiple devices, and being able to use the exact same structs/representation and algorithms on server and client is pretty neat. It’s like Node, but in reverse! But none of this is cause for paradigm shift, so I don’t think seeing a ”breakthrough” really is relevant.