I don't think a quick release of FF XIII Versus would hurt sales. It's not like they're the same game. Also a lot of people buy several games for $60 without a problem. If another FF game did come out a year later, do you think they'll be broke from buying the first? I mean seriously as long as the quality is high and the series continues to grow and maintains interest, I don't see how they could affect each other. Then you also have to consider the time it's going to take to do the Localizations for each game. Then consider that the PS3 will have price cuts over the next few years which will increase "Projected Life sales" into the 6 - 7 Mil Range easy.
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I don't think a quick release of FF XIII Versus would hurt sales. It's not like they're the same game. Also a lot of people buy several games for $60 without a problem. If another FF game did come out a year later, do you think they'll be broke from buying the first? I mean seriously as long as the quality is high and the series continues to grow and maintains interest, I don't see how they could affect each other.
Then you also have to consider the time it's going to take to do the Localizations for each game. Then consider that the PS3 will have price cuts over the next few years which will increase "Projected Life sales" into the 6 - 7 Mil Range easy.