I really enjoy both languages so it's great to hear an affirmation of this from Martin. Scala and Clojure compete only in the sense that I only have enough free time to really dig into one or the other but the approaches are different enough that they can certainly co-exist.
I'm not sure that that is a valid side-by-side, python by no means is a success because of Django but I'm fairly sure that lots of people would have never used Ruby if it weren't for rails.
