It seems to me that NaCl stands the best chance of reviving "code to the metal" programming in a web environment. 1. It is more cross platform than most native

It seems to me that NaCl stands the best chance of reviving "code to the metal" programming in a web environment. 1. It is more cross platform than most native code today - the same assembly runs on win-mac-linux without recompilation. 2. Has cross platform audio+3d (no AV input yet, but soonish I guess) 3. Your code runs in a web environment and is launched with a link, so you can leverage on the GUI support available in the browser.