You don't have to hire for Lisp, or any language for that matter. Picking up a language is way easier than fundamental skills (statistics for AI for example). IIRC Dan Weinreb of ITA fame said they gave their new hires a copy Practical Common Lisp and two weeks. You know, the book that you dissed earlier in the thread w/o an argument.

> less libraries are written.

Given that Sturgeon was an optimist[0], that is hardly a problem. The only reason why most OSS libraries are using is because people don't do the due diligence of vetting their dependencies. There are more than enough libraries of adequate quality for common tasks.

[0]: “And folks, let’s be honest. Sturgeon was an optimist. Way more than 90% of code is crap.” – Al viro