Prediction: PS4 will sell 20,000,000 by Dec 31. 2014

[Turkish]

Unlike Wii U which hasnt seen a lot of Wii people transferring over, a large chunk of the PS3 install base will move on to PS4, there is also millions of 360 fans uprading to the competition this gen. So the PS4 install base will consists of a pretty big minority of xbox converts.