What makes you say that the PS2 legs were due to the prices of the PS3 and 360?

Obviously it had good legs regardless due to more international launches, but it was extended due to the prices of the PS3 and 360. The Wii also greatly benefitted. The prices of the PS3 and 360 were so terrible that they didn't even peak until after year 5.

So how much over 1.1 mill worldwide would you expect the PS4 to sell from the 15th to Christmas Eve, I assume that's when the PS4  would sell 95% of it's post the 15th stock , or does  the post Christmas sales week  equate to a very large weekly figure.

360 peaking that late was due to S model+Kinect, not price. This can be seen by the fact that it was the same price in 2010/2011 as it was in 2008/2009.

360 launched at $299/399 depending on sku (1.2m)

In 2006 they added a $479 sku (6.8m)

In 2007 they dropped to $279/349/449 (7.9m)

In 2008 they dropped to $199/299/399 (10.9m)

In 2009 they discontinued the middle sku and dropped the high sku to $299 (10.1m)

In 2010 they got the S model at the same $199/299 price and Kinect (13.2m)

2011 had no price cuts/revisions/new skus (13.8m)

Sales grew steadily having its first peak in 2008, its 3rd full year, the year it reached an entry level sku of $199. Sales dropped slightly in 2009 then had a large boost in 2010/2011 while retaining the same pricing as the previous years.

Yeah but the PS4 peaked in year 4 and it had a great starting price. I don't know man I just don't think the prices of the PS3.360 had that great of an impact on the legs of the PS2.

You don't honestly think it's only going to sell just 1.1 million in the last two data weeks of the year, plus 2 days. Especially after it just sold 800k in the recent update, and that's after adjustments. Even if sales dropped by 100k in the next week, that would leave it with 400k left to be sold with just 9 days to go, including the day before Christmas Eve. 

So either sales absolutely tanked in the last 16 days of the year or the system is slightly overtracked up to this point.

The 360's price wasn't terrible.  It had a $299 SKU and a $399 SKU at launch.  Now, you could argue that maybe people held off to see what the PS3 was going to offer, but there wasn't really anything wrong with the 360's price.  The real reason the PS2 did so well is because they were able to get the price down to $129 by the time the PS3 launched, and $99 a couple of years later.  At that point, it was cheap enough for pretty much anyone to pick up.  Especially in smaller countries that they launched it in late in its life.

@ OP

Damn.  So, we are looking at 93M-94M shipped.  Only two more quarters to hit 100M, and probably pass PS1.

S Model and Kinect is a price difference, since the S Model has more HDD. And you don't mention other markets. Also worth mentioning heavy value bundles started late gen, further increasing the price gap of 360 early and late years. Black Friday became bigger due to major (temporary) price cuts. Kinect and S model helped, but price was the biggest factor imo.

PS2 did well against those high price points at the start of the gen.

~5 years after launch 360 had all the price points, including a £149.99 model (and other currencies) which was unseen before, allowing them to peak.

The 360 had little value at the $299 SKU, either way though as you mention the $129 price point compares favorably to either of the SKUs.

Well the PS2 had great legs during a slow PS3/360 launch.

The PS3 had terrible legs during a magnificent PS4/XB1 launch.

So what I am saying here is PS4 will either have good legs or great legs depending on the PS5/XB2 launch.