The thing with niche languages such as Haskell is that not everybody has to use them, but we ideally would get to enough critical mass that the ecosystem is sustainable, new and better tools are continuously being developed, and it's pretty beginner friendly. Clojure is probably at that stage right about now, Haskell doesn't quite feel that way, but it's getting better (more docs, guides, books, services like Stackage etc)

Basically it's very nice when a language gets enough traction that the lack of users is no longer a concern for its long term prospects.