Think about it, It has infared, Gyro, Accelerometers, A home button with a plus and minus button on both sides (like a wiimote) It has Bluetooth to connect...
Infrared? I never new about that. Well, maybe it would work. The Wii remote already has an accelerometer and can point on the screen. You may be right..
There are 3DS games where miis have been seen ex. Pilot Wings Resort takes place on "Wuhu Island" which is the same island in Wii Fit and Wii sports Resort.