I think there's a sizable audience out there that would like to use more FP but would also like to be able to integrate into their existing infrastructure. If

I think there's a sizable audience out there that would like to use more FP but would also like to be able to integrate into their existing infrastructure. If you're already using Java it would seem much easier to sell "Hey, let's try Scala/Clojure for this, it can call our existing stuff" than it would be to sell "Let's rework substantial portions of our infrastructure so we can integrate with Haskell."