You're welcome! 
And yes, around those numbers are the most likely cases.
By the end of the year, the PS4 will officially the #2 best selling home console of all-time, the Switch will close to or passed the 50 million mark, and the Xbox One will be scratching and clawing to get to 50 million.

I expect Sony to cut the PS4 to 249 and the pro to 349.

So my predictions for the year:

PS4: 15-16M (maybe over 16 if we get a 199 model later in the year.)
Switch: 17-18M(maybe approaching 19M with a revision.)
Xbox one: 3-4M (yea this is going to fall off hard..... wonder if the system can hit 50M LT sales? )

I think you might be a bit too pessimistic on the XBO and Switch.

XBO should recover next month, it was so low mostly because the low price during the holidays cleared out all demand for the console in early to mid January.

Switch made the numbers you're predicting last year already with a much weaker game lineup (especially during summer and fall seasons) and yet is already considerably outselling last year's sales at the same time of year. I'm pretty sure Nintendo will have another go on the 20M this year, unless lowballing for sake of breaking the expectations.

Thanks for this thread, I really look forward to seeing it updated every week.

I also like your post I quoted, hope you'll update the calculation every now and then !

Tagging and as everyone else said appreciate you hard work!

Great work as usual.

So PS4 is down by ~20%, NS is up by ~23% XB1 down by ~30%.....

Percentages make this look good for the XB1. The actual numbers though are just sad.

Week 5 is out: http://www.vgchartz.com/tools/hw_date.php

NS: 250,586
PS4: 248,882
XBO: 58,798

Holyshit..Another 250K for the Switch for no reason...How did you get your first numbers for January ? Do you have access to the last 2019 adjusted numbers ?

Just updated!

We are now far from the time where PS4 could almost double Switch with nothing, now with 2 heavy releases it barely equal Switch with nothing and before the US 35$ pricecut.