the thing that made the psx so successful was its mass of games. anyone could buy a psx knowing that there would be games out there that would appeal to them. This I think will apply to the ps2 also. Console such as the Xbox will be mainly focused on pc style games and so only young-adults and adults will be brought to the xbox.
With the gamecube though most of their games will be aimed at the much younger generation, and because the GX doesnt play DVD\'s a lot of ppl may be drawn away because of this, who knows.
I still think PS2 has the best chance out there because everyone can get something out of it