Anecdotal evidence of teaching Scheme as a first language in a French university shows that it's rather easy to learn, provided that there isn't too much to be

Anecdotal evidence of teaching Scheme as a first language in a French university shows that it's rather easy to learn, provided that there isn't too much to be unlearned by the audience. Mind you, on 2nd semester they had to learn some Visual Basic and found it gratuitously complicated. Unwashed masses have accepted to learned very complex frameworks and metaprogramming tools around Java; those stuff are not simpler than, say, Common Lisp. They learned it because the consensus (among their peers) was that these were professional tools, useful for one's career. If a Lisp ever gained that fashionability, it would no doubt be learned very quickly by those "unwashed" masses, even if most of them wouldn't ever reach the guru status.