Sigh, how hard is it for you guys to see. Just do some simple math. At the current rate of 171,000 consoles a week for 52 weeks = 8.9 million
so about 9 mil a year for 8 years = 72 million
take into account that the price will come down and there will be better games coming out. It is safe to assume about 200,000 in sales worldwide a week probably around august of this year and continuing on until the end.
200k a week x 52 weeks = 10.4 mil a year.
so we're looking at around 80-90 mil by 2016. I personally believe it will sell 100m because it will be the platfrom of choice from 2009 and beyond.