Better javascript would be incompatible with javascript - best you can get will be "less sucking javascript". And you'll be able to use it somewhere in the far future, after four competing companies have implemented enough of it in a way that mostly works, their browsers have reached most of the internet and the brave open source community has developed the polyfills needed to fix the incompatibilities.

I'm not holding my breath. Javascript sucks, it will be everywhere and we are stuck with it.