Any kind of board controller (skate, snow, whatever) is utterly useless.
With no momentum to hold you up in the turns, it is a complete hindrance to the gameplay and no immersion results.
The headtracking one has LOADS of mileage though. I have TrackIR for my PC and it utterly rocks. However I feel the wii solution is more body tracking that head tracking - This is only 3 degrees of freedom (Translation), but for console games that would probably be OK. 6 degrees of freedom (Translation and rotation) on 1st person FPS and Flight or driving sims has to be experienced to be believed how much immersion it gives.
For 6DOF you need at least 3 LEDs though, so the wii sensor bar with only 2 can only do 3DOF.
However, it would be trivially easy for nintendo to release a hat with 3 IR sources on it and a holder for the wiimote (to put where you usually put the sensor bar). The easiest way to do this would probably be to imitate the basic TIR package and have an IR transmitter to put pointing at you (say as part of the holder for the wiimote) and a cap with 3 reflectors on it. An active hat with LEDs is another option (which is what I do with my PC), but you would not want that for a wii as you need to be able to jump around, and I think a hat with a battery attached would not work.
I think head / body tracking will see a massive increase in popularity soon, and it should be simple to add to existing consoles (eg like the eye toy for the PS)