Which MK would that be? If you're referring to the Wii or DS MK, that's huge, but if you're referring the one of the worst selling titles in the series, then... that becomes significantly less interesting.
Because the Wii U userbase is low, not because of anything the games did (wrong). They're on the same console, so perfectly fine to compare.
This would be like Star Ocean all of a sudden selling like FF in Japan. It's huge and will become bigger in the future.