Allow me to create an account, with which I can buy games and virtual console games and then play those games on any Wii/Wii U/3DS/supported device I might own. Much like iOS, PSN, or any other decent account. Preferably give me at least 10 devices I can have registered at once, that should cover say 2 Wii's/Wii U's, and a 3DS for each gamer in the house. If one breaks, I should be able to, without calling support and without any other major hassle deregister that device and register the replacement, and immediately have access to all my games again.
My household would immediately begin purchasing Nintendo products.
Until this one thing is fixed though? There is -nothing- they can do. I simply will NOT purchase games that are locked to a single piece of hardware forever.
It doesn't matter what new hardware they put out, what gimmick they have, what franchise or game they release until their online accounts are properly implemented.