The thing is what else is there that can substantially change the popularity of the Wii U that hasn't already been released? You've had most of the mainstays of the waggle games that proved wildly popular with WIi, and you've had most of the core multi-generational franchises (or derivations thereof) aside from SSB and MK8.
Personally I don't think either of these will cut it. Gamecube had both franchises, along with all the others that existed pre-waggle, and none of them helped GC take the generation, or eve secure a solid second place.
To be a serious contender Wii U needs new blood, and that's games that appeal to the ageing gamer crowd. Nitnendo's first party games are still largely targetted to the under 20 audience. But the mainstay of the gaming audience is now much older than that on average. Nintendo needs franchises that grab the attention of the 25-40 year old gamer, and not those gamers that grew up with Mario, Zelda, Mettroid and Donkey Kong just the gamer who still likes to play the sort of games they loved when they were 14.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
