"Same can be said for (Common) Lisp, which still live its half-life in form of Clojure, but is far away from the mainstream."

He says, on site written in Lisp, siting a language that proves the invalidity of his own statement.

For what its worth, while Lisp has never been a language with a big following in commercial development due to its focus on exploratory programming rather the delivering a "finished product", it's user base has actually been growing in the last 20 years or so.