it can be,however i think(but it's just personal idea) that Boon & Co consider Wii just a current gen console.And they're not the alone...
if MKArmageddon is the last for this generation,why in the hell they didn't put it for Gamecube?
Simply because Wii is just something more than PS2 and Xbox but nothing compared to 360 and PS3.
Also Resident Evil:RE5 will don't get on Wii,but for the nintendo system will fet out another RE.

Chances are that the next MK game will not be on Wii, simply because the system is not strong enough. PS3 and X-360 will have the next MK game.

It better be on the wii. if it isnt imma gonna go and return,save money, then buy the ps3.

MK has always been on nintendo so i'm sure it will. it might even come out before the other versions since it's not quite as powerful as the other 2 consoles.