Now i'm not 100% sure how Sony does it, but why would you use capacity on producing PS4's if that capacity can also be used for 5's.
The PS4 userbase is large enough to maximize profits. Why add another 5-10%, if you can grow your smaller userbase for the next cycle faster?
EDIT everything above 80million is just food for the fanwars
"I think people should define the word crap" - Kirby007
Join the Prediction League http://www.vgchartz.com/predictions
Instead of seeking to convince others, we can be open to changing our own minds, and seek out information that contradicts our own steadfast point of view. Maybe it’ll turn out that those who disagree with you actually have a solid grasp of the facts. There’s a slight possibility that, after all, you’re the one who’s wrong.