> Having a large successful project in clojure is lovely, but much of the community’s concern around it is that its hard to maintain, and falling in popularity, broadly speaking.

What community? The larger software community or the clojure community. I personally see no logical reason why a "large" clojure project would be harder to maintain then say a java, python, ruby, javascript, etc.. project. If anything, the guiding principles that make Clojure a well designed language at the micro level should have an exponential effect the same way poor decisions do.