It's niche but used enough in the industry to give us tools like Coalton (https://github.com/coalton-lang/coalton/), used enough by hobbyists to give us nice new libraries (new TUI library: https://github.com/atgreen/cl-tuition/blob/master/examples/R...) and exceptionally good and fast open-source compilers (SBCL) (with a good bus factor and contributors from the industry, like Google), it has enough libraries to allow us to ship software to clients (web clients, web servers, web UIs (webview, webui), SQL libraries, etc). It's niche but the motivated developer can publish a game on Steam (Kandria).
(btw, ABCL has the benefit of Java libraries, for those interested)
Julia has its own issues (and isn't on par outside of scientific area).
I can also quote about 5 companies using Common Lisp in production, and there are enough paying customers to keep Allegro Common Lisp and Lispworks in business, yet that doesn't mean we are going back to the same amount of market presence as before the AI Winter event.
no that doesn't mean we are going back to the same market presence, indeed. Do we have or will we have a useful-enough market presence?
Here are some more companies: https://github.com/azzamsa/awesome-lisp-companies/ (only the ones we know about)
Now compare that list to the amount of companies using the top languages listed here,
https://redmonk.com/sogrady/2025/06/18/language-rankings-1-2...
Hence my niche remark, naturally there are a few using it, otherwise Allegro and Lispworks would have filled for bankruptcy already.