Wii U doesn't contain an accessory that is unnecessary.
Gampad is the reason the menu system/browser/eShop/Miiverse/etc works well and is intriguing. Its also pivotal in multiple games from creating intense atmosphere in ZombiU to offTV play in general and quality secondary features in games like Pikmin3.
If Nintendo chose to remove gamepad, then their better option would be to release an entirely different console.
Same cannot be said about Kinect. Everyone I know doesn't even use the features beyond Xbox On or Xbox Off. Nothing else about it works very well most of the time and nearly all games do not use it for any form of feature, primary or secondary. Its largely a useless accessory that drove up costs.
Nintendo's issue has never been the gamepad. Its always been its identity, games, and specifically lack of a "wii sports" type of title that easily shows why a person should buy the console. Hopefully that game is coming at E3. So Nintendo's focus on smart bundling as shown with MK8 is their smart choice.
MS's issue isn't games. It has primarily the same games as PS4. Its always been price and overcoming the negative press surrounding launch, hardware power, etc. Removing a largely useless product to that of an add-on one can buy if they want, makes A LOT of sense for them as now they can be equal on price too.
So the real answer to your poll is "Both".