In all fairness, Ian to an extend is right.
Third parties KNOW that the Wii is market leader, but still ignore it. Granted, this is slowly changing thanks to the examples Golden mentioned, but they really gotta try to include the Wii.
The Ghostbusters game is a great example of multiplatform releases. Yes, the Wii version is different from the 360/PS3 version but at least its being released and shown at the same time as the HD console versions.
To a certain extend, I understand that downgrading an HD game to Wii standards can be hard because if not done right fans will complain about it (think Dead Rising Wii port). But it can be done, even if it means the game is slightly different from the other versions.