Yeah, but

I imagine a future where an "operating system" is just a OpenGL + Networking + JS API, and you just load in HTML5.exe. The benefit of something like this is that it puts the power back in the hands of the people. You don't have to worry about Google and Apple restricting what you can do, you just load in the HTML5.exe that you know works. Want a new feature? Fork Firefox on GitHub.

(I don't want to belittle the technical achievement here - it sounds pretty cool! But I can't help but wonder wheter using the CLR or the Java VM wouldn't be better for many use cases, or even plain x86 machine code with virtualization.)