Real racing games just don't seem to be Wii friendly with the developers. Look at Nascar 08'. In face there hasn't been a Nintendo Nascar game in a few years, atleast by EA Sports. It's highly unlikely that any F1 games will make it either. Had to jump on the PS2 bandwagon to get my racing fix and have not been disappointed.
Exactly, I don't see where the problem lies because it could just be the same as the PS2 version, and they could just use the controls like for Need for Speed Carbon - that would be their motion sensing criteria filled.
All I can think of is that this particular game would show just how little the graphics power of the Wii holds up to the other 2. Not to knock the Wii, I like it very much, but maybe they were just not allowed to put it out on the Wii for whatever reason. Why no Gamecube? Maybe Nintendo doesn't like the series.