I think if there are less than 10 million total lifetime hardware sales by years end and less consoles sold in december 2014 than dec 2013, that is with no doubt the surest sign of failure, regardless of how good or bad MK8 and SSB are and how they sell.
It would not be surprising if either MK8 or SSB experience a soft debut and subsequently stay in the top 20 throughout the rest of the year and surge again for the holiday season.
given that SSB will be a 3DS release too, I doubt that the WiiU version goes totally unnoticed.
I predict NX launches in 2017 - not 2016







