I don't see myself ever using Clojure. It's missing too many of the good things from Common Lisp: readtables, imperative constructs (PROG, LOOP, etc.), separate function/variable namespaces. Lispworks and Gambit have better concurrency primitives than Clojure. I've never needed Java interop, interfacing with C libraries is much more important. If I ever go back to doing functional programming it's going to be in Haskell again because it's not worth giving up imperative programming unless you get the combination of static typing and monads in return.