The Web is HTML. HTTP is Hyper Text Transport Protocol. I think you're advocating for a JSTP that just cuts out HTML and CSS entirely. And at that point, why not just serve up compiled JS since it will be less bandwidth, right? Goodbye open web.
For compiling JS to be widely used, there has to be a decompiler or interpreter in most major browsers. It's no different than distributing binaries written in any compiled language.
