These numbers are almost identical to my predictions as well. Except I have Wii U at 13.7 mil.
I believe 12.7 is a bit too low, and I can't see going below 20 million, UNLESS the market substantially shrinks. Because even the smallest market size for Nintendo was with Gamecube at 12-14%. I also believe that they will keep selling somewhat decent in Japan, in addition to the occasional boosts from heavy hitters such as Smash and Zelda series etc....
Regional Analysis (only MS and Sony Consoles)
Europe => XB1 : 23-24 % vs PS4 : 76-77%
N. America => XB1 : 49-52% vs PS4 : 48-51%
Global => XB1 : 32-34% vs PS4 : 66-68%