I find Indeed.com to be a fairly objective indicator as to the job market for a particular language:
http://www.indeed.com/jobtrends?q=scala+developer,+clojure+d...
http://www.indeed.com/jobtrends?q=scala+developer,+clojure+d...
http://www.indeed.com/jobtrends?q=scala+developer%2C+clojure...
This is probably acting as a proxy for growth in programming jobs and IT in general.