I'm actually glad you brought up this debate. With every weekly sales data I always see GT5 on the list and no too far down. New PS3 owners are still buying GT5, and since I doubt there will be a GT6 for PS3, GT5 gets all the sales.
However GT5 won't get the same environment to generate late life sales like GTAIV had. Wii U is coming out in only a month and I'm fairly certain at least Sony or MS will bring in an 8th gen console in 2013 (probably won't be Backward compatible like older Playstations either). So even if GT5 is matching GTAIV weekly sales now, doesn't mean it will hold up.
GTAIV managed 2 million sales between 100-200 weeks, I don't think GT5 can manage that when 200 weeks from now PS3 annual sales might only be 4-5 million units.
Still I won't condemn people for thinking GT5 will make 10 million. I think it has a great chance of beating the Gran Turismo record low of 9.36 (GT2).
However regardless of weather GT5 sells more then 9.36 or even 10 million units, does it matter? Every prior Gran Turismo game had its sales phased out by a sequal after 2-3 years of release (with the exception of GT4), and they all had a second GT game available on the platform. GT5 will not be getting these setbacks.
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