As a rough (optimistic) estimate the PS3 will have sold 2.25 Million units in North America, 1.5 Million in Japan and 1.75 Million in the other regions as of September 30th; for a total of 5.5 Million units after 10.5 months on the market. A reasonable (optimistic) estimate for the following 3 months would be 2.5 to 4.5 Million units in the following 3 months for a total of 8 to 10 Million units; it will simply not pass 10 Million units in 2007.
The Wii should be (roughly) 12 Million units sold worldwide as of September 30th after 10.5 months on the market. Depending on supply Nintendo should be able to sell 4 to 8 Million units over the following 3 months for a total of 16 to 20 Million units sold worldwide; it will not pass 20 Million units in 2007.
The XBox 360 will be at (roughly) 11 Million units sold worldwide as of September 30th after 22.5 months on the market; being that (worldwide) it is selling at a similar rate to the PS3 it will probably sell similar over the following 3 months (2.5 to 4.5 Million units) for a total of 13.5 to 15.5 Million units worldwide.
Only the best years of the PS2's life did it pass 6 Million units sold worldwide in its holiday period, the only systems that are selling well enough today to suggest they could meet these kinds of numbers this holiday period are the Nintendo DS and the Wii.
