Whether or not the DS is ahead of the Ps2 now isn't all that important. There seem to be a fair bit of people who say stuff like that the Ps2 will sell 150 million, and that the DS somehow won't. That's rubbish.
If it performs like it did last year, it'll be at 146 million by the end of the year. It should then sell around 3 million by March, so say it's at 150 million by the time the 3DS launches.
The GBA did 22 million after the DS launched, and the GBA was actually quite close to the sales levels the DS is at now. For the full year before the DS launched, the GBA sold 18.6 million. For the last year, the DS has sold 23.6 million.
So Rol's throwaway line about the DS selling around 30 million more after the 3DS launches seems quite likely. That's 180 million or so in total.
