i reckon they could make a nice gun.... if they did this:
Imagine holding the Wiimote vertically.
Now in your left hand, hold the nunchuk vertically and infront of the wiimote.
Now imagine the plastic accessory framed around the 2 such that all 3 components (the wiimote, the nunchuk and the frame) forms and Uzi.
Now how do you shoot with the wiimote pointing at the ceiling? i hear you ask.
Well imagine that inside the Uzi frame is a mirror, angled to reflect the infra red from the wiimote down the barrel of the gun.