I'm actually pretty excited to see what will come of this. To my mind, this is the only thing PHP ever had going for it but it was the right thing at the right time and it's why Perl doesn't occupy that niche. I like mod_perl plenty but it's just not suited to shared hosting and budget hacking. mp2 was, IIRC, supposed to address some of that but it seems it was too difficult/complicated for typical hosts to deploy or the functionality didn't pan out. I don't know enough about it. Maybe perrin or another mp guru could elaborate on that. :)
If there were a stable, easy-to-deploy, shared environment friendly way to get Perl into the mix I think we'd see a pretty major power-shift in the small-business/personal-website game over the next few years.