Well, you asked when PS3 sold that good, and I give you the numbers VGC showed. For your interest, VGC shows around 3'5 mill PS3 sold in 2010 and 2011 too. They're stillbetter numbers that the ones VGC will show for PS4 in December 2014.

Edit: And by VGC numbers too, X360 sold 4 million each December of 2010 and 2011. I expected PS4 to put into shame both consoles this December and was the opposite.

This contest Wii lifetime PS4,
The PS4 will be around 40-45 million by that time still damn impressive

You are using numbers 4 years into the Gen after new consoles and price drop had happenned. Look at 2006 and 2007 numbers, only Wii putting any such kind of numbers. A year from now, $299 PS4, you think numbers won't be higher.

Growth is going to be enormous for PS4's sales this year, I would say at least 50% increase compared to 2014, market appeal is huge, there are a tonne of exclusives coming, 3rd party sales appeal is going to be in Sony's court even moreso this year for new owners, so sales of over 21M are probably likely this year, just based on the games already announced for the system, with much higher sales than that if the system gets a decent price drop and GT7 releases (which I think is pretty likely), I wouldn't be shocked if Sony has more games to announce for 2015 either.

I think PS4 is set to sell at least 40 million by the end of the year, with 45M+ likely if what I mentioned above happens. In that shipments will definitely be at between 41-46M by the end of this year.

Momentum will carry into 2016, GOW4 could be landing in March 2016, Sony probably has some big exclusive for Feb next year too.
I think PS4 will have shipped 51 million units by March 2016.

I first compared December 2007 Wii numbers, the perfect comparison with December 2014 PS4 numbers, but I was using PS3 and X360 2009-2011 numbers too, because through Jan-Oct those consoles had similar, even lower sales, but still sold a lot more in Nov-Dec than PS4 this year. The fact that those consoles were 4 years into the gen didn't affect PS4 sales during Jan-Oct, so why should have affected during Nov-Dec??? You can say in 2009 ps3 had the slim version but what about 2010 and 2011?. That's my point. 

Sony underdelivered during this period in my opinion based on PS4 sales before November, compared to direct rivals in similar situations. If PS4 was over Wii sales before October (shipment sales, at least) during the same timeframe I expected at least similar numbers at the end of 2014, but what we have is PS4 around 1-1'5 m less than Wii in the same period. That's a lot I was not expecting.

Of course PS4 will sell a lot more in future holiday seasons when they drop the price to 300$, at least, and maybe that's what avoided PS4 to reach more than 4 mill sold in December this year like Wii did in 2007. Price is a huge factor during November and December, and after what XBO has done in USA just with pricecuts, PS4 can do wonders at 300$ next year. We'll see then....

Why? Sony likely shipped 20 million in the 1st 15 months (that makes it 31M over the next 15 months), that's at the slowest sales time the console will ever have. Fabs will be ramping up production of the APU, RAM to get volume up and prices down, Foxconn can definitely handle those kinds of numbers of production and it's not like Sony can't handle that level of shipments, they've done it before.

Demand is going to be huge with such a huge number of exclusives, major 3rd party, Japanese focused games, the first major and official price cut, China, gaining more of the market overall because PS4 is that go to system.

31 million shipped may sound ridiculous, but really it's only just over a 50% increase compared to the previous 15 months, demand will more than likely be there and the capabilties to manufacture and ship those numbers are definitely there. Nothing about this is impossible.

I already answered this. A 50% increase for a slew of new exclusives, one from one of Sony's biggest franchises of last gen, an overall exclusive line-up that is widely regarded as a massively more impressive than last year's line-up, actual Japan focused releases, huge 3rd party line-up that will be in PS4's favor, the first official price cut and the Chinese release.

Yeah a 50% increase over the next 15 months is the least people should expect compared to the last 15 months.

Explain why you think it isn't happening. Can you?

PS4 wont get to 50 first, but will sell more than the wii in its lifetime.

Since the two consoles have such a wide variation in price I think the more important question is which one generates that amount of revenue the fastest. At 50 million consoles, the Wii had generated $12.4 billion dollars in revenue.

To achieve this, the PS4 has to sell 31,250,000 units.

This is a more honest gauge of equivalent achievement given the disparate price of console.

Is this sold?

If so we're looking at PS4 needing to do about 26.5 million this year, and then 5m early 2016.