At my $work, most of our code is in Perl, roughly a half-million lines of it dating back to the mid-1990s.
There's no point in rewriting it in something else, since the cost in resources to do that would outweigh the potential salary savings by hiring cheaper programmers who know Python or C# or whatever. (My experience with some other companies is that they want to move away from Perl because Perl programmers are more expensive, not because it's a worse language.)
Likewise, there's no point in starting new projects in another language since we'd then have to hire people people competent in both of those languages.
My experience is that people who turn their nose up at "old" tech like Perl are not worth hiring. If they don't care to learn about the technology you are using, then they won't care to learn about your industry or your company's business logic.