Regarding GT5, I wrote this in another thread.
Compared to GT3, this is the case.
GT3 released in Americas/Others with 13M Ps3s WW.
GT5 should release with at least double of that.
GT3 did probably not sell at all after February 05, as then GT4 was released in Americas/Others. At that time the sales of Ps2 were at 80M. Realistically, GT3 didn't sell over 10K weekly for more than 2 years. That means that it sold at least 12M of its sales with an userbase of 13-50M.
GT5 will probably also sell 10K + for max 2 years only. If we assume that Ps3 makes 10M a year after GT5 is released, it will sell pretty much all its sales with an userbase of 30-50M, and that is looking pessimistic at it.
So I'd say that GT5 has a better situation to sell much than GT3 did.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS
