It wont in 2014, MK+ SSB +Nintendo console at Christmas will easily beat the only good exclusive system seller XB1 have : Halo 2 remake.
Multiplatforms wont be as good system sellers as Titanfall for XB1 as long as PS4 exists
Predictions for end of 2014 HW sales:
PS4: 17m XB1: 10m WiiU: 10m Vita: 10m