I'm all for a new version of Javascript that eliminates the junk and keeps just the "Good Parts", but I'm averse to anything that serves to abstract away the bad parts by building a subset of functionality on top of the existing version javascript for a niche application (server framework in this case, other cases include cappuccino for UI, coffeescript for...everything? etc.)

The Javascript that can be used only via add-ons is not the eternal Javascript...