He's completely over simplifying it. Eve in statements like "When they stop selling them, they will lower the price", sales never 'stop', they simply don't meet targets.
Perhaps you're saying that as soon as they become demand limited Sony will drop the price, I don't know if this is the case, it really depends on their ability to drop the price, and whether this drop in demand occurs one month from now, or 6 months.
I doubt PS3 will sell 12million this year, even after they drop the price to $399. It's possible, but given the faltering demand we're already seeing, I have my doubts. PS3 just doesn't give consumers enough reason to want it, everything is available on 360 at a much lower price, it needs the games to set it apart, I don't see that happening this year as MS has a much better 2007 exclusive lineup.
I agree with Dr Evil, 2008 is when PS3 will start to pick up real steam.