I'm not sure even that question is a good one to consider - I think the market already has shown what happens when attempts to move off JavaScript happens with

I'm not sure even that question is a good one to consider - I think the market already has shown what happens when attempts to move off JavaScript happens with Google and Dart. The various other browser vendors didn't bite, and the industry as a whole remained with JS. IMO the best question we have given the realities is "what can we do to make JS workable?"