As said by the previous poster, the recession trumps population growth and does much more. Add on to that emerging market power and lower launch aligned price point, I'd say Wii's selling twice as "good" as PS2 was selling.
Also, do you have information regarding specific demographics? How many 13-year-olds were there for PS2 to sell to and how many there are for Wii to sell to?
Not just that, Wii has a much higher household to user ratio than PS2. I'm not exactly sure what the numbers were, but I think it was like 2.2 for PS2 to 3 for Wii? That means more people "own" a Wii than PS2 in every household the console visits.
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