So, perhaps this will at least help to explain why I look at “this language vs. that one” arguments with a very puzzled eye. Software systems are built using languages, and, having been thus constructed, never depart from them; nor should they.
First of all there are still new projects that do things from scratch. They aren't yet built using any language, so your point doesn't apply. It's well worth to discuss the advantages and disadvantages of different languages for a new project.
And second, sometimes there are reasons for rewriting systems in another language. Those have to be very good reasons, but they exist. Among the most commons one are "we need to support a new platform, and our programming language doesn't run on it" (for example perl doesn't run natively on the most popular mobile operating systems, Android and iOS), or "the misfit between a new requirement and the programing language is too large" (for example it's basically impossible to do formal verification on a perl code base, or meeting certain real time requirements).
If you regard Perl, or any other language, “as an end unto itself” in this business, I submit that you are ... and I do not mean this “personally” ... missing the point, entirely.
Sure, the question is usually not "is Perl a good programming language?", but rather "is Perl a good programming language to do $X with it?".
But of course you can look at the bigger picture, and look at many different tasks that need doing, and ask yourself if Perl is a good (or maybe the best) programming language to do each of these jobs. And that's what people do when they ask "is Perl a good programming language?", and even if it's not related to one specific case of doing business, it's still a very valid question, and one we have to answer for ourselves again and again. Both because the tasks that need doing change, and because the competition also changes.
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