FFXIII has no chance. While it will undoubtedly sell well, the sales will also be extremely front-loaded, just as they were in Japan and just as they have been in all regions for the last several games. It'll have one week at #1, then maybe another week or two in the top 10.
Between the other two it's a toss-up. Neither series is known for having particularly strong legs: they both do better than FF historically, but they both do poorly enough to be vulnerable: depending on what gets released around that time, either one might be knocked out of the #1 spot after a week, putting them at a tie with FFXIII. They do, however, stand a good chance of remaining in the top 10 for longer than FFXIII will.
Complexity is not depth. Machismo is not maturity. Obsession is not dedication. Tedium is not challenge. Support gaming: support the Wii.
Be the ultimate ninja! Play Billy Vs. SNAKEMAN today! Poisson Village welcomes new players.
There is much to hate about modern gaming. That is why I support the Wii.