Well, Groovy has never been "sexy" (in a CS sense) in the way Scala or Clojure are perceived to be.
Despite that (or perhaps because of it) my experience has indicated it's in wider use than either, and it has some enterprise-y backing (SpringSource) so I expect it's not going away.
Both Scala and Clojure are attracting people who weren't originally on the JVM though, which (again anecdotally) I don't think you can say of Groovy.