It doesnt matter how long console is going to be on market.It Matters how long can console keep selling good until fell below 90k. NES was out longer than PS1 but PS1 still outsold it. PS2 sold that good because it never stopped selling like crack till holiday season 2007.PS2 always had good software to give it a boost.
Wii has sold 50 million for 3 years ( 48 million but lets make it simple )
Lets say will will also sell 50 million in next 3 years. It would be 100 million. In 2012 wii is starting to slow down and sells only 25 million in 3 years. It would be 125 million. In next 3 years Nintendo stops making good software for wii and wii sells only 10 million. It would be 135 million wiis sold by end of its life cycle. So there you go.Nintendo suports wii for 12 years and wii sold 135 million and becomes first Nintendo console to sell above 100 million but it doesent outsell PS2.
But this is just my predicting. It can go far worse or far better for wii







