North America is becomming a bigger market, Europe a smaller, Japan's equal

[elprincipe]

Final-Fan said:
I can't believe no one has mentioned that the numbers are skewed by the huge sales bias of the 360.

The 360 had a year's head start, and it is VERY disproportionately popular in North America. The 360's share of the total install base has shrunk rapidly and will continue to shrink. This will also cause North America's share of the total install base to shrink, all else being equal.

Honestly though I don't think the effect would be huge in the end; probably it would zero out the shift from EUR to NA. And then of course other factors might cause NA to pull ahead after all by end of gen.

P.S. If the 360 did in fact get mentioned before, I apologize for being blind.

Excellent point.  I think the biggest factor is that Wii and PS3 have been available in Europe for shorter periods of time than NA/Japan.  In a couple of years Europe will have a significantly higher % of worldwide sales than last gen.