I know this is an odd statement to be made because most Nintendo fans here are expecting this game to be the hottest release later this year on WiiU, but I'm here to cut the chase.
WiiU numbers the week MK8 releases: 6,290,343
WiiU numbers today: 7,258,201
One million looks good right?
-I don't think so. WiiU took more than 4 months to sell half of the numbers PS4 sold in Destiny's week.
-MK8 is selling extremely well even to this day. But it didn't move as many systems as people had believed it would be. So SSB., being even more obscure than MK and being cross-platform with 3DS, won't move just as many systems as MK8 did.
-The belief Christmas is always good for WiiU might as well be a downside this year, now that the competition is also more interesting/strong and offer a vast range of games to chose that people will consider getting without thinking rather than a 1st party WiiU obscure title.
-Most Nintendo fans don't care bout graphics and that's a proven fact (and it's also ok). They will simply get the 3DS version if they only have a 3ds. SSB won't be a decisive game into buying a WiiU if you were on the fence. Nintendo seemed to make 3DS WiiU's more feracious rival right now.
-MK8 is proving that people still buy tons and tons of Nintendo games but Ninty isn't really capturing new audiences as they would like to be capturing.
So what people honestly think?
I think SSB.U will be WiiU's Tearaway: it will be awesome and people will beat you into buying a WiiU just to play it, but ultimately it will fall down into the obscurities of niche alongside the rest of the WiiU's library with it, while the 3DS version will end up eating most part of sales and making it the definitive place to play the 8th gen's SSB (sound sad I know).
EDIT: Can someone please move this to sales discussion? Thanks!