It's already too late to make HTTP something sane. What we need are developers who understand and appreciate simplicity and minimalism, to make something awesome with a chance of actually catching on. (Please don't xkcd/927 me.) And they'll have to be fierce in protecting it against third-party extensions (which may not even be possible with something this popular.)
That's unlikely to happen, so I guess we'll just keep playing this perverted game of Jenga ad infinitum.