I spent many years building some pretty good production software in Java and it certainly paid my mortgage and let me grow in important ways. I did tinker in the background with Ruby, Erlang, Python, Groovy, etc etc and tried to bring them in as testing tools or whatever when I could. There are still many things I like about Java and working in Java obviously makes your work available to a vast number of programmers.
I feel incredibly lucky that Clojure (and Scala and ...) are possible choices now and that I've managed to get to an experience level where I can make the judgement to recommend it and have an employer listen to me.
I do apologize for not personally making the majority of the industry use Common Lisp 10 years ago. My bad.