... it's just the way people use it.
Perl was designed as a powerful, flexible, loosely typed scripting language for munging text files and streams, and that's exactly what it is.
Perhaps it's not Perl that died, but the philosophy of Perl - the need for a *wicked fast* scripting language to code up 1-100 lines of code gluing together entire systems. The philosophy of which is power, speed, massive flexibility (very very loosely typed language, you could demo complex data structure creation on the fly using the REPL) which empowered the lone programmer, not the IT department or enterprise software firm.
The diminishing of Perl is indicative of the wild wild web being tamed, and the Internet corporatized. A sad thing, but definitely predictable. I still use Perl once in a while (I'd say once or twice a year for a new compact script), but I never really share those scripts.