Specifically, the Blub idea applies to language power. You could build python's libraries in Lisp, but you can't build a macro in Python without changing the language.

On the other hand, Lisp isn't at the top of the theoretical Blub hierarchy. Users of erlang can to some degree look at lisp as a Blub - what do you mean there's no lightweight concurrency, and you can't start millions of threads and have the messaging just managed? Lisp is broken! A language with Lisp's (lack of) syntax and erlang's concurrency might be able to look down on both.