You are underestimating Driveclub, the simple fact it will be one more good game to add to the list can push PS4.
Plus, you forget multiplatform, they sell much better on PS4, so they'll make sell more PS4 : Dying LIght, The Crew are not even listed on X1 ( same for KH 3)
Watch Dogs (and Destiny) has much more pre order on PS4
Predictions for end of 2014 HW sales:
PS4: 17m XB1: 10m WiiU: 10m Vita: 10m