[didibus]

I did find that bit interesting. It seems it's missing a leading "due to the commiters' better familiarity with Java."

Since you can argue knowledge of a language does help with maintenance and extensibility. With this, it also makes more sense for the following bit about finding people able to contribute. No contributors is pretty bad for maintenance.

At my work, we use Clojure, but I do often wonder what would happen if the current Clojure devs left. New devs unfamiliar with Lisps, FP, and Clojure would most likely have a hard time maintaining the code base and extending it, and if they try to rush it before really learning the language, would quickly degrade the quality of the code base, compounding the effect.

I think as long as you continue to have one strong Clojure dev on the projects, you'll be fine, as they can direct newcomers and help them transition to Clojure, but if you lost that, I think a rewrite in a different language would make sense, or there's a risk of the code base degrading quite quickly.