Borrow from a friend, or buy one.

Ultimately, the option would be there for all players, so there would be no balance issue.

Being forced to play a specific way over preferred styles to stand a fair chance is the very definition of a balance issue.

No it's not, because everybody has the option. Holding the entire game back because of the inherent limits of analogue control, that's a problem. Besides the fact that Wiimote and classic controls have co-existed in games like Goldeneye and COD on Wii.

Well I'll be damned

Local multiplayer is my bigger gripe. Not just the number of players but the type of activity. There should be bot matches, co-op, 2 player online etc. Anyway I guess thats for the sequel ;)

Yes it is, for the reason just given.

Anybody who is at a disadvantage chose that disadvantage for themselves. Holding back everyone and the entire game because of some people's preference for a less effective control method is the worse route.

Completely disagree. I am always the top player on my team and I use dual analog. I find motion controls (for me) inferior.

Good so you admit that is what makes an imbalance an inbalance, the only thing I was trying to get across here. I can't ignore how silly your second sentence is though. "Holding back everyone" then you contradict yourself by saying "some people's", makes sense as obviously not everyone likes motion controls, whereas everyone is perfectly capable of using the perfectly functional sticks that come with every Wii U system, hence no one is being held back. Could they have implemented the Wiimote? Sure, but by no means do they have to as it's not the system's primary controller. 

It is a balance issue, there is no way to turn around the facts. There would be ton of complains for that.