I don't know much about the issues related to a module being "core" or not, but I have found it a nuisance on Raspberry Pis to have to install cpanm as the large dependency chains of some modules makes installation die silently with cpan. Therefore I would like to see it as standard at least on the RPi. I would imagine that it would be unwise, if not impossible, to have it as "core" on Raspbian and not in other implementations, so my vote was "yes". But I may have been guided my my ignorance and will happily slouch corrected.

Regards,

John Davies