I realize that the proverbial saying is that digital technology is supposed to get cheaper with time but this time it won't hold true temporarily. Manufacturing costs for the chips will most likely stay the same for quite some time because of the fact that making chips on the state of the art wafers will provide no cost reduction when using the previous 28nm technology. The fact that multipatterning became the winner in order to to increase chip scaling means that chip designers will have a harder time giving incentives for the consumer to upgrade as multipatterning is a very expensive solution. This will mean that starting now, transistors are going to cost more rather than less when moving down to below 28nm technology.
This is the reason why I don't see the PS4 and X1 going below the $300 price point for a long time but that's not all ... This affects PC gaming too as that crowd won't be getting significant increases in the performance per price ratio in the future compared to the current consoles. The days of having gaming rigs that are 10 times more powerful than consoles for a sensible price of under $1000 in the extended near future are over for the most part. Some will keep using the having a better achitecture argument but that's mostly useless since they pale in comparison to the amount of performance gained by just simply having greater chip scaling.
