On the contrary, all of those are being taught in schools python is now being taught at introductory classes in MIT, Cal and Stanford to name some. Ruby and PHP are taught too. At lest in grad school. Don't forget the private turoring and certification programs you can enroll in. I have not seen a single certification course that involves Lisp. Also, consider the ages of those languages. Lisp has been around for more than 50 years now. The others are not even half its age.