Just posted Week 42 numbers, along with some adjustments.
PS4 was adjusted down, while XBO and NSW were adjusted up.

Did a few calculations now that the latest adjustments were posted and we're about to enter November.

By Week 42 of last year the PlayStation 4, Xbox One, and Nintendo Switch sold through approximately, 61.62722049%, 50.459829547%, and 48.3422765% of their final 2018 totals, respectively.

If those percentages hold this year, then the three systems' final 2019 totals would be:

PS4 - 15,005,334
XBO - 4,731,272
NSW - 21,055,978

That's pretty close to where my prediction was, except a bit better for Switch and a bit worse for PS4. I did a similar calculation, by figuring the percentage growth up to this point in the year for each system, and applying that same boost to what each system sold from this point last year through the end of the year.

Looks about right. I was expecting PS4 to hit like 16M, ut that was contingent on a permanent price drop to $199. But from all indications, it's safe and obvious to say that sony is content with its salles so far and what pace its selling at right now. 

(inhales)
...
(exhales)

HUGE adjustments I just made to the charts, dating all the way back to the first week of last year. And you better believe that has quite some affects on the leads and percentages of the data.

So, with the NEW numbers we have now, the PS4, Xbox One, and Nintendo Switch sold through around 61.27%, 51.064%, & 49.297% of their final 2018 yearly totals respectively.
If those percentages hold for this year, their final 2019 Yearly totals would be:

PlayStation 4: 15,108,137
Xbox One: 4,773,236
Nintendo Switch: 20,709,424

That would be great if Switch can pull up a 20+ millions this year. It has really great chances of doing so by Nintendo doing just a minimum of promo. Think it can manage to do more than that if they plan well with such a low price.

Thanks for all this work! I really look forward to your updates on this thread!

Switch is up ~30% YoY, but does anyone think like me that it's going to be very hard to keep those 30% up in November-December? I mean, 2018 had a very strong holiday period with Let's Go and SSBU. 

I think november ca be even or better in 2019 but sales are going to suffer a serious hit in december.

If Switch 2019's holiday sales match those of 2018, I think Nintendo can be satisfied even with the launch of the Lite.

Yeah I dont think it's reasonable to expect a 30% increase in December this year either but I cant see them taking a serious hit either. Several things to factor in here, while there is no Smash in December this year - there's an additional piece of hardware that should cater to a new audience while also gunning for the "several Switches per household", there's a brand new Pokemon entry and in it's third holiday I can see Nintendo having a couple great deals.

I think the holiday as a whole will be up vs last year, but not by 30%.

Just posted Week 43 numbers + new adjustments. The PS4 and Switch have both been adjusted up, the Switch in particular.

With the new adjustments and latest numbers, I calculated that the Final 2019 Yearly totals for all 3 systems would be:
PS4: 15,092,744
XBO: 4,749,716
NSW: 21,748,232