I see that as possible. This year it will be at over 20m, and with boosts from Killzone 2 and maybe God of War in the new year, it should be able to sell 7m consoles in the first half of that year. It is on track to sell around 5 by the end of this first half (without taking into consideration the effect of MGS 4), so it could just reach 30m, definitely shipped, but maybe not sold
EDIT: with better figures:
So far this year it has sold 3.5m consoles, the sources statistic prediction put it at around 13m, but MGS 4 and a price cut should push that up to 15m. That would leave it on 23.5m by the end of this year. So it would need to sell 6.5m console in the first half of the year. So far this year it has sold 3.6m consoles (360 has sold 2.7m for reference) so that should lead to about 5.75m sales (5.4 by adding half, 350k mgs boost). So it would only need to improve by 0.75m. I would expect better JP sales next year, and an extra boost from KZ2 especially in the americas, but there will not be the GTA boost or GT 5 p boost, so it will only improve a tiny bit, so I don't think it can quite reach it, it will make 29m though
