The comments here are great and answer the question in various sensible ways, but I slightly wonder... could Perl make a comeback if it got its own Rails equivalent? You could argue that Laravel has done a lot for PHP (though of course PHP never went into the wilderness in the way that Perl did). Perl 6 seems to have a lot of magic in it, and I wonder if any of that could be usefully leveraged to make something very modern, very clever, and very Rails-esque that actually might get people interested in using Perl 6.
(See also Phoenix and Elixir.)