I work near a team of people I'd consider "good JS developers". If I were to just go over to their workspace and say, "We should totally use Clojurescript", they'd look at me with a mixture of "LOL, Emacs" or "This guy's a loon".

However, if I were to give a presentation talking about how I took X and rewrote it as Y in Clojurescript, and the benefits of doing that -- time, ease of debugging, code readability -- I'm pretty sure that they would not dismiss it immediately. (Of course, this would require me to actually learn Clojurescript well enough to rewrite my JS things in it. ;))