While your quote from Duell has insight you have are ignoring two things.
- The subject matter we are talking about is Perl 5 which limits our scope.
- Questions that are generally ask and answered are short and focus on fairly basic concepts or approaches. You don't see questions that are more than 1 page in length.
Within these limitations there are really only so many questions that can/will be asked. Questions of greater length or time are more likely to be discussed on a mailing list focusing on the specific details on the subject. In fact we tend to encourage it. So I still stand by my previous point, there are going to be few new and interesting questions.
why separate Perl 5 from Perl 6
The one thing I would point out is that we should categorize these separately. They may have the similar names they are really different languages and should be not be intermingled. It will only create confusion.