The 100 million userbase for PS2 is complete bull shit. If that is actaully the case, why is it that the games for the 360 and orignal XBOX took 12 of the top 25 spots on the NPD with 1/5th of the audience of the PS2 alone? I have personally owned three PS2's, my brother has owned two, both are rotting in a box in the basement, a friend of mine only owned one, but he hasn't bought a game for it since the Gamecube came out. The fact that a system is purchased, does not mean that particular buyer is still in the PS2 game buying market. People talk about GBA sales, sure that is great, but who is buying GBA games these days? Just because mom bought her 6 year old a GBA, and a 5 dollar Finding Nemo game, doesn't really equate to any sort of dominance, or established fanbase. And if you look at recent GBA game sales, they are about five higher then actual system sales.
Point being, the PS2 can keep selling forever, but their software sales are going down substantially despite this "giant ever growing userbase." Shit Gamecube and XBOX are still selling, yet their overall software sales are decreasing. Which proves the point that modern sales of 5 year old hardware is irrelavent. The people buying these systems now, are not the types that are going to be buying a lot of software in the future.