My guess it's a proportionally low number. I looked into matlisp when I did my PhD in scientific computing - none of the other people I worked with had any interest in it. I couldn't pursue it since I would have to reimplement or interface each and every library myself, a workload I couldn't justify at the time.

So, although lisp might have been great, in the end I stayed with Python/C++. Guess I'm not the only one with similar experiences.