Just to answer the clojure question, my take on it is that the popularity of the project in general means that the rate of new contributors is greater than the

Just to answer the clojure question, my take on it is that the popularity of the project in general means that the rate of new contributors is greater than the rate of those leaving even when you allow for rejections. That's a fairly enviable position to be in, and your average open source project can't rely on being the next clojure.