Some people are saying releasing Mario Kart and Smash Bros too close would be bad but I think it might be a good idea. If Smash comes in the spring then that means 3D Mario+DKC+Mario Kart+Smash Bros all release within a 6-8 month period which in theory should get a ton of Nintendo fans on board and significanlty increase the Wii U install base.
After that have the summer months focus on smaller niche core titles like SMTxFE, Bayonetta, and X which will most likely benefit from having a bigger audience to sell to and those big titles from the first half of the year should be able to carry Wii U for a few months.
Then for the holidays have 2-3 relatively big titles ready, if Zelda is ready have that, if not then Yarn Yoshi+Pokemon Fighters+Wii Sports Club Retail could probably do the trick. Also next year there will likely be much better holiday deals for Wii U, maybe even down to $199 on black friday and DKC/Kart/Smash will be having there first holiday so a megaton title isnt absolutely necessary for Holiday 2014.
When the herd loses its way, the shepard must kill the bull that leads them astray.