6 mio. through September is possible, if on the upper bound, Destiny and the tier 2 countries will do something for XB1, after all. That would make it about 3 mio. YTD 2014, give or take a handful of 10000s. I would estimate between 2.8 and 3.5 million (so 8.8-9.5 LTD through December 14).
History tells us, Q4 (Sep-Dec) sales are about 50% of a calendar years sales. So, to reach toasts prediction XB1 had to sell double of what a console historically does in Q4 and so about 2/3 of its 2014 sales in three months. It won't.
Destiny might spur holiday sales early and sales usually go up from September on so there is a remote possibility that October can reach September sales (would be around 800000 then) or more when holidays really kick in. But then even 150000/week would mean a doubling of recent sales, 200000 a threefold increase, for comparison the 360 grew its weekly sales by around 20% (or less) between its first July and October on average .
3.2 million in November (four times October) is more than XB1 will sell in Nov+Dec combined, possibly even Q4 (see above) 2 million in Dec is still too high given that sales will decline by 60-80 percent the week after Xmas. As noted in the other toastboy (Xbone One tier 2..) thread, Nov and Dec can be million-sales-months for XB1, but more like 1-1.4 and .8-1.2 millions, respectively .
(PS4 though, might reach 3.2/2 million or more in Nov/Dec, by Sony's GC numbers (10 mio) it will be about 7 mio YTD through Sep and thus sell around that or more for Q4, that would mean 18+ LTD through 2014).
