Any Chance for a Mario Kart Wii Sequel?

Why can we have 2 Super Mario Galaxy titles on one console but only get one Mario Kart game per console?

Not sure if there is anything to this Mario Kart Turbo Circuit, but it looks cool. At least let sell us some additional tracks or content via the Wii Channel...

It's probably the only thing that would get me playing my wii again.....

I almost considered joining a facebook group asking for a sequel - http://www.facebook.com/group.php?gid=90676673760