I actually think we've moved away from other languages and back to javascript recently. The browser competition means that javascript engines have become a lot faster and so are capable of a lot more than they were and things like jQuery/prototype/moo paired with json the recent developments like node.js, commonjs have given it longevity.
This established base makes it hard to move away from js, but then what reason have we at the moment?
But are you saying, as it appears at the end of your para, that we're getting more meta-langauges that compile to js script?
Not only more meta-languages. In the second link it's shown how Lua can be compiled to javascript. And in time, python, ruby and other LLVM languages. Reframing javascript from a language into a platform is a trend. GWT, Cappuccino and Sproutcore did a bit of it in the past, but this wave is not interested in web javascript only, but in javascript wherever and whenever: node.js, web, embedded, etc
