I think its absolutely because of languages like coffee script that JavaScript is changing, but don't take my word for it. You can find statments from standards makers to the same effect.
This is a great talk to watch about the development of JS. It's been a while since I watched it, but the point I was making, and the point I gleaned from this talk, is that new ideas need a test bed, and according to Eich Coffeescript is one of those places where new ideas are tested, and derived from.
I don't think it matters what came first. CoffeeScript has had a great effect on hearts, and minds because you can use it. It matters that CoffeeScript exists because people can wrap there head around new concepts and ideas. Only once people really understand an idea can we determine if it's good, or bad.
Fat arrow is well understood in the JS community because of CoffeeScript, and that is one reason why people are pushing for fat arrow to be accepted. I personally think CoffeeScripts has had a very large impact on the idea.
