FF Type 0 sales make that even more logical :
http://www.vgchartz.com/game/82938/final-fantasy-type-0/
http://www.vgchartz.com/game/82939/final-fantasy-type-0/ 5 times better on PS4, it would be the same with FF VII and it will be the same with FFXV, with current install base of each console
They surely understood that the small extra they would get with a One version would cost much more than refusing a sony partnership to fund the game
Predictions for end of 2014 HW sales:
PS4: 17m XB1: 10m WiiU: 10m Vita: 10m