Worldwide, without Japan, almost no chance of 360 version outselling PS3 IMHO. By the time it hits US/Others its likely PS3 in Others will have higher PS3 than 360 install base, so like with many recent multi plat games I expect PS3 to outsell 360 in Others for the title. In Japan its going to be zero on 360 so no surprises there. In US 360 will outsell PS3 but I really don't believe it can outsell it enough to cover the delta from Japan and Others.
Also, I have serious doubts that enough PS3 owners are going to not buy as some sort of protest. A few might - but in my experience gamers are terribly weak when it comes to 'I'm not buying that game' in protest mode. They buy... even when said game is rubbish. So I doubt millions of PS3 owners who want FF are going to duck the purchase because its on 360. If anything when push comes to shove they'll probably buy if only to enable PS3 to beat 360 for WW sales.
Try to be reasonable... its easier than you think...
