Well, I hope I can help you out here. I saw the Super Mario World cartoon on PAX TV (
http://www.pax.tv/) about a year to a year and a half ago, at a very early time slot (I videotaped the cartoons). You can contact PAX at
http://www.pax.tv/contact/corporate-contacts.cfm, and I think they really answer their e-mails. Their phone number is (561) 682-4267. I also used to watch the Mario cartoons on the Family Channel (around 1995 or '96), which became Fox Family not too long ago. Fox Family also ran the Donkey Kong Country show and the Mega Man show, so they're a good choice. Fox Family's phone number is (877) 983-2645. Kids WB does Pokémon, so they're worth a try also. Otherwise, the Cartoon Network does all kinds of cartoons, so I'm sure they would put Mario on (though probably at a bad time slot). I hope this helps you bring back the Mario cartoons. Good luck! ^_^
--Andrevan
~The Nintendo King~
Andrevan@aol.com