I think you underestimate the kind of problems programmers face. Though I believe that one must be able to program in any language suitable for the task at hand and not just one specific language of his choice. The fact is learning a programming language is an investment in time.
If any language can get your job done, then you wouldn't have business guys putting up 'Required a candidate with 12+ of C++ experience'. Even to the business the programming language matters.
It matters because they have to hire people, they have to pay people for a skill and they have to maintain the software for years. There fore they need something widely used, people for which can be easily hired and something that is going to hang around for a long time
When you look at it from this point, I don't think Perl is in a very comfortable position compared to a tool like say Python.