Holiday boost setting in for all three, next week will be very telling. Still seems likely to me that the Wii takes the holidays again this year, but not nearly by the margin it did last year.
End of 2016 hardware sales:
Wii U: 15 million. PS4: 54 million. One: 30 million. 3DS: 64.8 million. PSVita: 15.2 million.