In a Lisp program you can write a program that writes Lisp programs. So it has a kind of open future. Now no one actually does that yet, but its still possible. In the other languages its almost... you can't write a C program that will write a C program. Its just... there aren't any verbs of the right kind.
Classic example of the lisp evangelism idiotism
What is he taking about? It seems trivial to write a C program that writes other C programs. Is he referring to something else?