Core Wii titles cannot replicate what you can have on other consoles with different controls. just the Controller alone is not enough to make the game appealing (even though it plays better on Wii than other consoles i.e. Resident Evil 4). It has to do something additional that comes directly from the game design.
Marketing is another issue. A developer must think differently and go invite the people to try the game. This means going out there to show the game to people is a possible strategy







