So there is a chance for MK8 to be the worst selling MK of all times.
What makes you come out of nowhere and say that? Kinda random :-/
It should outsell NSMBU which sits at 4mil and still growing. I think the lowestis 5.5mil (gba), if WiiU sells at least 14mil lifetime, mk8 should be about 6mil sold imo.