My thoughts on why the ps3 will eventually win this gen.

[Cypher1980]

Using your example and employing accurate mathematics.

Sony PS3 units sold = 14.6 million
Launch 11/06
Present 08/08
Time since lauch 1 year 9 months = 1.75 years

14.6 / 1.75 = Units sold per annum = 8.342 million

10 year lifecycle would point to 83 million units sold if sales remain static.