Scala would be a fucking awesome mainstream language.
http://www.indeed.com/jobtrends?q=F%23%2Cclojure%2Cscala&...
The (+), (+'), "=" and "==" thing has started to bother peeps
http://groups.google.com/group/clojure/browse_frm/thread/59a...
http://groups.google.com/group/clojure/browse_frm/thread/506...
http://www.indeed.com/jobtrends?q=F%23,clojure,scala,+C,+Jav...
But maybe this is just a result of comparing relative growth rates of job postings. If you take the time to a look at the percentage of matching job positions, then Scala is pretty dominant (compared to Clojure and F#) :D
BUT, I can't see Joe Public programmer adopting a functional language, even one as nice as F#