Will Mario Kart 8 have a better attach rate than Wii Sports? And Super Mario Bros?

[Darwinianevolution]

So people seem to think MK8 won't get close to the 80% attach ratio of Wii Sports. Okay, fair enough, 80% is a monumental number to beat, even with an small userbase. Maybe something less big? Will Mario Kart 8 have a better attach rate than Super Mario Bros for the NES?

Mario Kart 8 (WiiU)	5.11m copies sold	9.55m userbase	53,75% aprox
Super Mario Bros (NES)	40,24m copies sold	61,91m userbase	65% aprox.