As I'm writing this I'm aware that not a lot of people currently own an NES Classic due to a massive understock by Nintendo! I would also wager that the number of NES Classic owners that also own a Classic Wii controller is even smaller, so maybe take this as a helpful tip for when you go to purchase Nintendo's new console!
Gamexplain has uncovered that, through the use of a classic controller, you are able to reset your game without having to touch the console! That will be super handy for when Nintendo develops a controller cord length that gels with the size of modern living rooms! Check it out.