The 2nd half Wii U line up is fairly strong though.
It has 3D Mario World (highest rated game of the fall) and Wii Sports, Wii Fit, and Wii Party which should be bringing in casuals. It has OK support titles in Pikmin 3, Rayman Legends, etc. as well this fall.
If NSMB + Mario 3D World + Wii Sports + Wii Fit + Wii Party + Mario/Sonic (which represent I think six of the top selling Wii titles) can't even boost Wii U sales to GameCube levels, then something is very, very wrong.
X and Bayonetta 2 are not going to sell any more than Pikmin 3 and that's if they're lucky these are non-factors, DKC (unfortunately) probably as well (what's DKC supposed to do that Mario 3D World and NSMB couldn't?).
Mario Kart and Smash Brothers are really the only market impacting titles I can see for the Wii U in 2014. Maybe that Pokken fighter if it has NFC toys. Third party development is likely going to dry up in 2014. So it'll basically be on these two/three games to sell the entire platform.