It is highly likely that people who are new or returning to gaming because of the unique and intuitive interface and games of the Wii are going to be interested in more conventional games as time goes on. This, in no way, means that they're going to eventually become interested in the PS3 or XBox 360.
It will be a gradual process, and people who are interested in Wii Sports, Wii Fit or Rayman Raving Rabbids may end up picking up Mario Galaxy, Mario Kart, The Legend of Zelda, Metriod or whatever well crafted conventional game is available; but they will probably not become interested in buying an XBox 360 or PS3 when one of these games is released for it because they will not see an additional value (to justify the system purchase) in what that game offers over what is available for the Wii.
