Wii: November 25th 2006 - January 5th 2008 = 19,894,369
PS4: November 16th 2013 - January 3rd 2015 = 15,087,310 (as of November 22nd)
With 6 weeks left, the PS4 has to sell an average of 802.000 units per week, for it to best Wii's first year results, and with Black Friday and Christmas coming up, I say it is bound to happen.
PS4 is currently tracking higher, than what Wii did Holiday 2007, here is a comparison.
-----Wii 2007--------------------PS4 2014--------------------------------
Nov 03: 296,372-----------Nov 01: 314,356 = 06.07 % (17,984)
Nov 10: 282,996-----------Nov 08: 553,533 = 95.60 % (270,537)
Nov 17: 469,651-----------Nov 15: 481,003 = 02.42 % (11,352)
Nov 24: 673,069-----------Nov 22: 734,388 = 09.11 % (61,319)
Dec 01: 699,757-----------Nov 29:
Dec 08: 728,498-----------Dec 06:
Dec 15: 686,612-----------Dec 13:
Dec 22: 1,462,609-------- Dec 20:
Dec 29: 737, 820-----------Dec 27:
Jan 05: 386,299------------ Jan 03: