Well, they wouldn't ONLY be selling PSP Go's. They would also be selling regular PS2s and PSPs. Let's ignore them for a moment, though.
Say they slash the price by $100. By the time they get around to that, it would be a $90 loss or so (perhaps less, but let's stick with that). Let's say they sell 7 million PS3s from then until April.
7*90 = 630. $630 million lost.
Perhaps they sell 2 million PSP Gos. $180 million back. $450 million left.
Let's say they get $30 from a first party game sale. They would need 15 million first party games sold to perhaps 4 million new PS3 owners. That's a bit ridiculous. If they get $20 from third party game sales, that makes things easier.
So I would say a price cut would still be a good move- some of the losses would be offset by the GO, some by extra software sales (and extra accessory sales).
(Former) Lead Moderator and (Eternal) VGC Detective 
