There are plenty of old business systems which are critical, can't be removed or turned off, and use LISP, COBOL, etc. Meanwhile, nothing important uses Clojure or other trendy flash-in-the-pan language. If you want an interesting project, sure, use Clojure or something. If you want money, learn COBOL.
That's because gigs in trendy languages come and go, and you might earn good pay for six months, whereas cobol gigs run for 20 years and pay consistently high salaries.
