The whole point of lisp is competing with 500 programmers blub programmers with 5 lisp programmers.
I wouldn't measure Clojure's success with those kind of numbers. The number of applications running Clojure code would come close to a real metric.
The whole point of Java and Python is to provide VPs with massive departments to bloat their egos with head counts. Clojure or Lisp don't aim for such goals.