The destiny of complex languages
It seems to me that the more complex your language, the larger portion of the total extant codebase written in that language will have been authored by programmers that do not completely understand the language. I would venture that if you took all existing Perl code, about 80% of it was written by programmers or sysadmins with cursory knowledge of the language. And within the Perl community, finding truly competent programmers with solid mastery of the language is definitely the exception, not the rule. I think the combination of ruby's largeness and complexity coupled with the huge popularity of rails means the same is true for Ruby. But I don't think there's anything about Perl or Ruby that makes it this way other than just it's the nature of having complexity in your language.
I'm solidly in the camp of tiny, simple languages with programs authored by programmers with mastery, and this post has been interesting food for thought for me on this topic.