I have to agree that we are talking about shipped numbers here not sold through. I know that doesn't normally make a difference, but bear in mind that Sony claim to have shipped 10m PSPs and have probably only sold about half that amount. I think the same is true of PSTwos.
I think somebody picked up that something like 3.7 million PSTwos have been shipped to Japan? Well this is a crazy number as it's only been selling about 30k a week since xmas and sold maybe a million tops before xmas? I can't see many more PSTwos being shipped / sold in Japan, and I think we have similar stories in the US and Europe. Supplies are plentiful, look back to the Y5 Q1-Q3 for PS2 where it sold about 4.5m in 9 months compared to much higher rates beforehand. Well that was because there was so much stock around so they didn't ship any more while it sold and then brought the PSTwo out.
I really can't see it selling another 30m like some of you are suggesting, it will pass 100m without much trouble tho- maybe 110 or so when finished. I can't see price drops having a huge effect when the next gen comes round, sales are already slowing in the US (250k a month?) and again I'd be suprised if it had sold much more than half of the supposed 10m? shipped to the US.
That aside, it is still an astounding achievement, mainly due to huge increases in the US and Europe (and the PS1 basically created the market in Europe to start with), but sales in Japan have noticably decreased quite significantly and this is definitely an area in which I think Nintendo will see much more success with Revolution, following on from the DS.
Edit: and Sonycowboy you really should be a marketing man "almost the same sales in half the time" is really quite misleading as though you are expecting there will be no drop-off in sales. The fairest comparison is 96m PS2 vs 76m PS1 in the same timeframe (but PS2 was always quicker out the gate than PS1 anyway) so about 20m lead.
Also the whole "selling more at higher price" is definitely to do with PS2 having a good 12 month lead on the competition and it was priced higher supposedly due to DVD playback and so on. PS1 was always a cheaper system in it's lifetime, they dropped to 199 and 149 pretty quickly, especially when N64 came out. That doesn't suddenly mean that now PS2 is at 149 it will sell as much as PS1 did at 149 since it's at the end of it's life, not the start!!