Also, more CPAN libraries seem to be in a state of atrophy these days and I think the long-looming specter of perl 6 has had a depressing effect on that community.
The post talks about Moose, which is a behemoth with huge and varied dependencies and must be be tougher to maintain these days. Every time I've tried to write a project in Moose, I've regretted it in the long run.
However, I've written plenty of big, enterprise-class projects in perl instead of buying them from major vendors. Over the years, we were almost always able to beat the value proposition of Big Software precisely because we had a solid team of perl coders.