I think you may be a bit quick to dismiss its perl legacy as being a negative. Sure, PHP is more widely-used on the web these days, but I'd actually guess that more people know perl than PHP, given how ubiquitous it is in *NIX.
Perl is more flexible and much faster (though mod_perl in Apache is arguably slower, depending on config) than PHP. That said, it's a bit more cryptic, and not using mod_perl means that things are usually less dynamic, but thousands of sysadmins and more low-level technologists already have perl as a staple in their toolbox.
I know a significant number of people who rely on MT for exactly this reason, and it's one of the few (only?) remaining heavyweights in the field that covers that perl market. I'd think it'd be a mistake for them to switch.
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