It depends how much longer Sony is getting cocky

I think it'll cross over 50m just barely maybe 52 - 54ish mill

Man you can get a  PS4 slim with 3 games for £180 here. Can't see anyone willing to pay £400+ for a console. Don't think it's a good move for them

I also recall a lot of people here over optimistically forecasting that PS3 would easily sell over 100 million and pass Wii to finish as the 7th gen leader when all was said and done.  This was being said here as late as 2013 when PS4 was already on the market.  4 years later, the PS3 fell about 15 million short of those predictions.  Don't take this as me saying the PS4 won't sell 100 million.  I'm just pointing out that under-estimating and over-estimating work both ways. 

Personally, no I don't think the XBox One will sell 50 million.  It's sales have peaked already, so it's all downhill from here on out.  The people who multiply years at a time by forecasting 6 million a year for the next 4 years, that's not how it works.  That's the same kind of logic as the people who, in 2013 when PS3 was 26 million behind Wii, were forecasting 6 million PS3 sales per year over the next 4 years will close that gap.  Sales don't stay fixed like that in the back nine of the average consoles lifespan. Look at the 2nd half of the PS3's lifespan for example: 2011 (14.7 mil),  2012 (12.1 mil), 2013 (8.2 mil), 2014 (3.5 mil).  The first full year the PS4 was on sale, the PS3 lost over half it's sales from the year before, and was down 3/4 from where it was the year before PS4 launched. 

For the XBox One to do 60 million as you anticipate, I think it would have to show a year on year increase in sales this year, which I don't see happening.  It's sales had already plateaued when it was just contending with PS4 and Wii U.  With the Switch on the market now, I don't see how anyone could forecast an uptick in XBox One sales over what it has shown already.  And no, I don't think the XBox One S is going to change that.  Once sales drop to a certain point, I think Microsoft will have to move onto the next platform and then yes, XBox One sales will indeed take a full on nosedive.  And, I say this as someone who owns an XBox One but has barely turned it on since getting a Switch at launch.  (I'm disenfranchised enough with Microsoft this gen that PS5 might be my next console purchase.)

The PS3 will still end up close to 90 (87, 88, something like that). It's insane to suppose that the PS4 will end up just marginally better when it is closer to combined PS360 numbers when we align launches. If you're saying that X1 won't do 50 and that PS4 won't do 100M, then we can stop making consoles and call the gaming market dead, because those are horrible numbers. It is however possible that PS4 steals sales from X1, so it ends up above 50M and PS4 gets an extra 10 to 15M from these market changes.

X1 is at 30M and it is 4 years old. X360 (4 years) was at 37M and that was in the end of the year. I really only see X1 failing to 50M if PS4 starts to beat the crap out of him until he is completely dead. While Sony is increasing their advantage, they aren't being aggressive or competent enough to do and onslaught.

If you're using the sales pattern of the PS3 to illustrate the sales, I've already done some calculations with all PS consoles and they sell at a similar pace (proportionally, of course). That's was when I saw Ps3 wouldn't pass 100M, because simply using the PS2 curve adjusted to PS3 resulted in 87-90M. The same PS2 curve puts PS4 at 130M. To make this calculations, I used the separate data for EU, Japan and NA (because these consoles had different launch dates per region) and aligned the numbers. That's exactly why the VGC news posts that show PS4 and PS2 aligned sales shows that PS4 is ahead, they didn't considered that PS2 launched several months later in big regions. Just align the numbers and the results make a lot of sense.

It's all on my profile, Ryng_Tolu kindly provided me the numbers and helped me with the estimations.

I think xbone will hit 50 million, but it'll limp there and probably just barely pass it, reaching it after the next xbox is released.

no.

Yes.

XBOne weekly sales are currently fluctuating between 3rd and 4th place, and it's sonorously beaten by PS4 and NS, but this makes people incorrectly forget that its YTD sales are actually up YoY. Although far behind PS4 and NS, its current YoY sales trend on any period longer than two weeks is up, not down.

So after 569 votes, 55% say that no, it will not reach 50 million.
Poor Xbone. :'(