I don't have one.  

My gut told me.

End of story.

Haven't you ever used your instinct before?  It is the mechanic I am using to derive my prediction. 

I'm not sure what you're asking.

Wii U 16.5M
XOne 29M
PS4 48M

I usually wait till after post holiday adjustments, but I'll come back and make mine sometime during this month. My predictions for 2015 did quite well, overshot the One and 3DS (again) and severely undershot the Vita (heavy adjustments).

Do all of the sub-50M PS4 people want to revise their prediction now?

Alright. Now that Sony has announced the PS4's numbers at 35.9 million.

PS4: 56-57 million

PS4: 55 million
XOne: 27 million
Wii U: 14 million
3DS: 63 million
NX: 2.5 million

I think people might be over-estimating the sales for 3DS and Wii U in 2016 by a bit. If NX gets announced at E3 and releases in 2016 both of these consoles are going to have very weak second halves. I predict that the NX will have a strong launch with some possible supply issues.

I want to thank everyone for their predictions thus far.  

To show my appreciation for this, I have compiled a brief numerical summary:

Sony Playstation 4:

average - 52.1

high - 58

low - 37

Microsoft Xbox One:

average - 28.1

high - 40

low - 22.5

So if we get the worse end of the stick the PS4 with sell only 1.1M, the Wii U 300k and the Xbox One 3M throughout 2016 :)

I think 2016 is going to be slow, but nowhere near that slow.  Keep in mind that many of these predictions were using the December 12th numbers.  

I have updated the OP with the December 26th numbers so I will understand if anyone wants to make an adjustment.  If you do this, please quote your original predection along with your new one.