Javascript is missing some feature that will take it to the next level, and I'm not sure what it is.

Maybe it needs a compile-time macro system so we have go full Java and have magical dependency injection annotations, Aspect-Oriented-Programming, and JavascriptBeans (you know you want it!).

Or maybe it needs to go the Ruby/Python/SmallTalk direction and add proper metaprogramming, so we can finally have Javascript on Rails, or maybe uh... Djsango?