I think they probably could get to 150 million, but they just don't want it.
I mean they could cut the price to $199.99 and then further in the future to say $159.99 ... but the consumer that buys at that price doesn't pay a lot for games and I think there's not much incentive for Sony to lose that much in unit profit per unit just to get more sales from the type of people that don't buy a lot of new software.
These are not the types of people that are going to spend hundreds of dollars for Sony on PSN, they are the types of people that want dirt cheap software and $19.99 bargain clearance games from Best Buy and maybe the yearly single COD or FIFA.
Doing the math it probably makes them more money to keep the fatter $100+ profit margin they likely enjoy on the PS4 even if it only sells 15-20 million more units rather than cut that margin substantially just to hit 140, 150 million.
