I agree that this is the future. But that will mean telling everyone that they should now run their node_modules through Babel - no inconsequential feat, given the size of the code that must now be transpiled.
It's not just that - is JSX part of ES6? It isn't, but a lot of pre-Babel transpiled code uses it. So people would need to transpile to ES6 for distribution, then to ES5 when someone uses the library.
