for most who've not read the manual to the Nintendo Wii is backwards compatible for all GCN games and older games from the VC, it is true you do need a GCN Controller to play GCN games aswell as a Memory Card (won't save GCN games to the Wii's HDD).
TWW is already on the GCN so I dont think there will be any need for having TWW on the Wii as well, coz ppl who own a Wii can just as easily go by the GCN games & Controller & Memory Card. (if you dont already have)