That's why you have been supporting Emscripten with... just one developer, it's creator? Shouldn't there be a whole team towards this goal you envision?
Currently emscripten should have the amount of people three.js has.
There is a team working on the longer-term goal, including game platform, JS engine, and Mozilla Research people. Why did you assume otherwise?
Also, Emscripten has a strong github community. Unlike Google we can't afford to pay everyone who might be needed -- we also prefer not to if we can build a wider community from day one.
Also, Emscripten has a strong github community. Unlike Google we can't afford to pay everyone who might be needed -- we also prefer not to if we can build a wider community from day one.