I believe what you see with multiple web frameworks may more often be the misguided attempt of Clojure newbies to reimplement
what they already know instead of kind of stepping back and understanding what they actually already have available via Clojure.
I can't find the reference anymore but I think Stu Holloway once said something along the lines of there is a tendency of new devs picking up Clojure to try and rewrite Rails. And that it was a mistake.
The real concern you express about Clojure having "missing or rotting" libraries is harder to quantify. I will say that has this has not been my experience at all. I actually find that I write one-off programs very frequently with Clojure - to call web services (REST or SOAP), serve a http-friendly API via liberator, and other similar work. Grabbing an older library that works seems to be quite easy most of the time.
I do think in the early years of Clojure some groups were looking at Clojure as if it could become what Ruby was to Rails. Meaning, could you use it almost as a marketing tool, e.g. "our devs use Clojure and thus are more powerful." It isn't/wasn't a terrible idea from that perspective but I do think that is one that has somewhat fallen by the wayside. The motivation behind some of the multiple "Rails-like" Clojure libraries may more have been an effort to build a new 38 Signals and not so much fix a real need for a web framework in the Clojure community.
Rich Hickey was looking at Clojure as a better tool for thoughtful software development and maybe even planning for what he might build (like Datomic) with it. I remember at the first Clojure/conj conference he gave a talk and expressed some amazement that other devs were already using Clojure to do production-like things. Everything since that time may have been an interesting side effect of Clojure being a lovely language for devs who were already strong with Java or Javascript so the interop was not a big deal. And its in the interop where maybe most devs should look for these "missing or rotting" libraries?