I\'ve found a few related questions, like Python vs. Perl (now deleted) and Is Perl Worth it? (now deleted), but I can\'t seem to find anything that directly a
I don't understand the point of this question. You have a job and you already know Perl. You can ask whether or not to learn new languages and which ones to learn (please don't, but you could), but none of us can or should predict whether or not you're going to get another job using Perl.
You ask, "Is having this job on my resume ultimately going to make me less employable, especially if the language no longer grows?"
Well, it's better than a blank resume, and you can't change your past, so really what are we talking about here?