A lot of posts saying illogical this and that, yet they don't change the fact that main series FF games have averaged over 2.54 million copies sold on Playstation consoles in Japan including FFX and FFVII with both selling over 3 million copies (VII rounded up at 4 million copies) in the past and there are two coming exclusively to the PS3 over there which should be good enough to generate the sale of at the very least 1 million new PS3's in the region.
Also all of the Gran Turismo games have also sold well over a million copies in Japan which should generate at the very least 500,000 new sales for the PS3 in Japan. And while Forza Motorsport may be able to cut down on GT5's appeal in the West, Japanese consumers will pick the Japanese game.
Even if no other game causes any PS3 consoles to sell in Japan this year, these two (three games) will still result in the PS3 having sold 4 million consoles in Japan between its launch in 2006 and the end of 2009 (5 to 7 million high end), while the most the 360 can hope to sell in Japan by the end of this year is 250,000 more units while 150,000 seems a much more realistic number for what 360 will sell there between now and 1-1-2010.
Even a difference of 3.5 million would be enough to guarantee far fewer Japanese exclusives coming to the 360 (especially in light of the fact that Japanese consumers won't even buy games in popular Japanese series in significant numbers on the 360 -- both Tales of Vesperia and Star Ocean 4 failed to sell more than 250,000 copies in Japan and were soundly beaten by a rather average new ip from Level 5 in sales there earlier this year) and more coming to PS3 in the future than in the 360's peak year in Japan of 2008.
Even the difference of 2 million units between the two consoles that exists now has demonstrated that it is large enough to shift games that were originally thought to be the 360's biggest exclusives from Japanese developers like Ninja Gaiden II and Tales of Vesperia into being released on PS3 (in more complete forms) thus further mitigating the appeal of the 360 to Japanese consumers.