Different people, different jobs. For what I use Perl for (and have used Perl for for more than a dozen years), PHP is not an option. I don't do webby stuff. If I had to replace the stuff I've written in Perl by stuff written in another language, that other language would be shell, AWK or C. And whatever language I might have learn if I hadn't learned Perl. Python probably. Ruby maybe, but that's quite a newcomer. And had I learned Java, I might have written some of it in Java.
But whether or not "perl is dying", I don't care. Perl exists. Even if no new versions appear, it doesn't cease to exist. And it won't stop doing what it's doing. It won't effect me, nor my job, if everyone else stops programming Perl.