As more and more people write software in languages that compile to JavaScript instead of directly hand-writing JavaScript the demand for JavaScript becoming a better compile target grows.
In that sense adoption of Dart, ClojureScript, TypeScript, Elm et all will continue to accelerate JavaScript (language and runtime) improvements.
Re:JavaScript at 20
by BrendanEich on Saturday May 16, 2015 @03:31AM
(#9555319)
All part of the plan. I've been saying this since 2012, Dave Herman and Alon Zakai of Mozilla Research (asm.js creators along with Luke Wagner) said it before me:
http://brendaneich.github.io/Strange-Loop-2012/#/21
Love it when a plan comes together!
Some were excited Dart might lead to some sort of bytecode VM being added, but that didn't lead anywhere. And since then, JS has become more bytecode-like, so it doesn't really matter now anyway.