Too many variables to jump into conclusions at this point. We don't really know what's going to be the X1 and PS4's real baseline once the dust settle. We especially don't know how is gonna be PS4's reception in Japan.
And about the Wii U, well, I guess we need to wait and see what is goingt to be Iwata's plan to turn things around. I truly believe there will be another price cut and maybe a SM3DW or MK8 bundles.
Anyway, let me throw in some numbers just for the heck of it:
PS4: 15-16 millions.
X1: 10-11 millions.
Wii U (without price cut) 9-10 millions.
Wii U (with price cut) 11-12 millions.
3DS: 55-56 millions.
PSVita: 10-11 millions.