I don't think Clojure has to loose if there is a renaissance of the JVM, however it will have less space to exist if Scala becomes what people think when they think "FP on the JVM" (and it's starting to become the case).
I don't think Clojure's popularity will be heavily affected by Scala's, but rather by the contingent of people who want to do dynamically typed and/or lisp-y programming on the JVM. I see Clojure competing more with Ruby, Python, jRuby, Lisp, etc than Scala. There may be some subset of those who can and will cross-over to statically typed Scala, but I think that for most part dynamic fans tend to stick to dynamic languages.
If there's a language-based JVM renaissance and we don't end up in a place where what targets do rather than what they're written in (beyond "language X makes this problem easier", anyway), then I'm not sure it's really a renaissance.
