I honestly have never really understood the argument that there are 100 million PS2 owners just sitting around staring at their computers trying to decide whether to buy the PS3 or 360. People are constantly upgrading, but a large chunk of the PS2's audience was the budget gamer. Around 100 million of PS2s sold were sold at under $200, and the budget gamer isn't going to end up on the PS3 or 360 because the price of games and system is simply too high. Most of those will end up on the Wii.
Most of the "hardcore" audience of the PS2 has already upgraded to a Wii, PS3, or 360, because they are early adopters. The vast majority of GTA owners are already playing one (or more) of these 3 platforms. The hardcore Gamecube and Xbox owners are as well. Most of what's left in the market today is by and large the casual gamers and budget gamers who the PS2 excelled at capturing, and the PS3 and 360 are ill equipped to lure in.
