It honestly really does come down to advertising for Nintendo.

I honestly don't think any of these are system sellers. Maybe Zelda, but I feel like the people that want to play that game already own a Wii U.

Bottom of the primary, top of the secondary, amounts to more or less the same thing. It's not on the same level as Mario. Animal crossing won't do much, it was a moderate success on the Wii for a first party franchise.

People put a lot of stock in Xenoblade Chronicles, and it may be the best game of those mentioned in the OP. But people should remember that on Wii Xenoblade Chronicles didn't even sell 1 million (according to VGC). So even if it sells similar or even better numbers to the Xenoblade Chronicles it won't push any hardware, other than somewhat of a push in Japan. It's about the only game on Wii U that I would like to play, but it's not enough to get me to buy a Wii U.

Zelda is definitely primary franchise, it not seller like Mario Kart or 3D Mario, but is very strong IP and have huge impact on market, especially new Zelda and not remake), it will sell lots a Wii U units, probably not like Mario Kart, but i expect at least to be on pair with Mario 3D World.

The only one there that will push consoles in any noteworthy number is Zelda.

Xenoblade X will provide something that no other Wii U game has so far. While people who would be interested in games like Kirby, Yoshi, Mario Party most likely own the system already, a lot of JRPG fans most likely don't.

The original game would have sold a lot more in the US if it wasn't delayed by a year and pirated to death.

I'd say AC and Zelda but I think the other fanbase that isn't buying into the WIi U at all must be objectively right because why else would they be wrong?.