Would you:
(A) Purchase and play the Wii version of FF XIII, if the game gets ported to the Wii.
or
(B) Play the HD version of the game, buying a 360 or PS3 for it (amongst other titles you may have wanted) if needs be.
I'm not posting this to discuss the feasiblity of a Wii port, so please don't discuss that here. Just pretend it could happen at any time.