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Soundwave said:

I have 

Smash (N64) - 5.55 million

Smash Melee (GCN) - 7.41 mill

Smash Brawl (Wii) - 11 mill

Smash U - 4.05 mill (as of Oct 2015)

http://vgsales.wikia.com/wiki/Super_Smash_Bros.

Nintendo has plenty of reason to want to release the Wii U version on NX. Looking at that list, I'd say a good 2-3 million reasons at least. 

On this very site Smash Wii U is at 4.7m, I'm in the camp that NX will release Q4 but even by then the console version of S4 will be at around 6m easy. I can see them porting the game for more sales and competitive tournaments yes but the game paid for itself long ago even if you took away the 3DS sales.