I'm not asking for lifetime sales. I'm just asking how much they'll sell in 2015 alone. Here's my prediction.

PS4: 14m

3DS: 10m

WiiU: 7m

XB1: 6m

Vita: 2m

What do you think?

PS4: 18 million
X1: 11 million
Wii U: 6 million
Vita: 2 million
3DS: 10 million

Wii U-7M
PS4-16M
X1-4M
PSV-1.8M
3DS-10M

Wii U 5.5m if that. Ps4 in the mid teens and Xb1 about 10m. Just off the top of my head without analyzing anything 

PS4: 17 million
X1: 7 million
Wii U: 4 million
Vita: 3 million
3DS: 10 million

lol

ps4 - 13 - 18 mio

x1 9 - 14 mio

wiiu 3,5 - 5,5 mio

psv  1 - 2 mio

3ds 7,5 - 11 mio

PS4: 15,000,000 (31,000,000)
XO: 8,500,000 (17,000,000)
Wii U: 8,500,000 (19,000,000)
3DS: 12,000,000 (67,000,000)
PSVITA: 3,000,000 (14,000,000)

ps4 19 million
xb1 12 million
wii u 8 million

PS4 16M maybe more since they have a killer 2015 line up. Great holiday push for end of this year and then Jan-March will start off with a bang with Order+Witcher (multiplat but still will be great )+ Bloodborne.

X1 10M maybe more depending on Halo boost.

Wii U 4M..

PS4: 16 million
X1: 10 million
Wii U: 5 million
Vita: 2 million
3DS: 11 million