Looking forward to the day when we're not afraid to abandon Javascript and look towards a more competitive development ecosystem in browsers.
When developing software to run natively in all browsers, there's one choice: JavaScript.
So the comparison isn't fair. C/C++ had to prove themselves among many competitors. JavaScript "won" by default, not because it's somehow the best choice.
I'm glad to see other options like Dart and PNaCl coming along. It's about time.