However it is not perl-specific. If your system would work with PHP, the concern would be the same.
Great point and one that some of the other responders implied. The challenge I take from your reply is to make sure my Perl is coded well, "best practices," and well documented so that another Perl coder could jump in quickly.
And thanks for the reference to the Tiobe Index, very enlightening.
"The important work of moving the world forward does not wait to be done by perfect men." George Eliot