PS4 still can have another price cut and they didn't released some of theirs big IP's like Gran Turismo and The last of us 2.So no I don't think this is year is the PS4 peak year.
PS4 - over 100 millions let's say 120m
Xbox One - 70m
Wii U - 25m
Vita - 15m if it will not get Final Fantasy Kingdoms Heart and Monster Hunter 20m otherwise
3DS - 80m