40 millions ? Without the shadow of a doubt, unless Sony decides to leave the console market in 2009 or early 2010
80 millions ? mmmh, hard to tell, depends on many things : price, support, life time, economic crisis... It seems reachable in 4-5 years
100+ millions ? I don't think so but hey, who knows ? The Wii might suddenly stop selling like crazy too... Nah, who's gonna believe it







