Seeing as someone has already built a fast and scalable blog using Clojure I'm not sure your arguments holds any water. Having used both Python/Django, Python/CherryPy/Mako/CouchDB, and Clojure/Compojure/CouchDB I'd say that Clojure is a pretty damn capable web application programming language. And compared to my experiences with PHP+SQL, it is light years beyond.

Clojure also has an extremely rich _core_ library of functionality - a lot of things that would simply be more work in Python or even Ruby can be expressed more succinctly in Clojure (yes I know Haskellers won't be impressed ;)

As far as communities I've found #clojure IRC orders of magnitudes more helpful than #django or #python (and both those channels aren't bad).