It's going to be difficult for Wii to accoplish this, as 360 will falter but PS3 will likely take up those sales. Wii will probably end up at about 40-45 million in sales by the end of 2008. 360 will likely be around 24 million and PS3 around 20 million. So Wii would definetly have to hit that max of 45 million, which is unlikely, but possible. But Wii in its lifetime may never be able to get 50%, unless of course PS3 doesn't take over 360's increases in America, as the 360 falters.