On a couple of specific points-- It'd make no technical sense to try and expose a low level hardware-oriented API designed for multi-threading to a slow single

On a couple of specific points-- It'd make no technical sense to try and expose a low level hardware-oriented API designed for multi-threading to a slow single-threaded language like JavaScript. Web Assembly will be mature soon, and on the timescales we’re speculating about it could well have some form of threading. Let there be vendor specific and proprietary stuff in web apps. Unfortunately that would be a security nightmare. The Flash and Java plugins are good examples.