The question is about writing Lisp code and nothing more Adoption is not about "writing more code", and if it was than surely Lisp would have a giant head-star

The question is about writing Lisp code and nothing more Adoption is not about "writing more code", and if it was than surely Lisp would have a giant head-start being 60+ years old. A more promising place to start would be understanding why it isn't the most popular currently - I doubt "Emacs isn't multithreaded" is anywhere near the main reason. You might also want to look into why Lisp-likes (for instance: Clojure) haven't gained more traction.