There is a thread asking if Nintendo cares about install base numbers, and
Jizz_Beard_thePirate pointed out that even if gamers dont by WiiU for Smash,
owners of the game and console will probably look into buying extra controllers for the game anyway.
So Nintendo profits. Not to forget Smash is helping to sell Amiibos. So,
It looks like Nintendo cares more that the existing install base spends money than bragging rights
to the biggest install base. Games like Smash and Mariokart do boost consoles sales, but more importantly
they ensure that owners keep spending money in the form of DLC, controllers, figurines, etc.