Depends..... if it's an iterative console, then there is really no limit to how much it sells over the future of the platform.

If not, then I'll go with around 125M lifetime; meaning how many console it will sell as long as it's still being manufactured.

Its still 349$.

My thinking is, PS4 neo is out and its 399$ (some PS4 fans rebuy a console), and the PS4 normal version drops down to like 249$.

249$ price point is going to make alot more people want to get a PS4.

The games are now there, the big ones like Final Fantasy 15, that ll make people go out and buy a console.

The "wii" effect steps in, casuals hear about VR and want to try it out, so people that dont typically buy a console, might to experiance what VR is.

On avg over the next 3 years, I can see it potentially doing 20m+ years.

I think we can answer this question once the NX is out and once the XBox plans are unvealed at e3, its not just up to sony how much they sell :D

but my prediction right now is it will NOT outsell the PS2 because the lifespan is going to be smaller. I assume it will sell around 100 milion

The problem now is whatever it does people will say that the amount isn't right because it includes the PS4.5...

I would like to see the new PS4 349 pounds and the old one 249.

120 Million LTD

PS2 sold 50 million units after PS3 came out so PS2 is unattainable unless Sony cuts price down to $100 when the PS5 comes out which I don't see happen. For Sony it's getting more important to have paying/subscribing users than counting the number of boxes anymore.

This year will be a 20+ Year, and 2017 probably also be, because of the new Model of the PS4, the games will be out, it will be cheaper, + VR, that also is a selling point, we will need to wait a little longer to see if it the Momentum will drop in 2018.

the PS4, just need to sell 2.3 Millions more than it sold last year to surpass the 20 Millions this year, and without the NX, there simple isn't any competition this year.

This.  I would expect 120m or even 100m * (PSN subscription profit on top of normal game profits and hardware profits) >>> 150m * (just game and hardware profits).  Sony also isn't as dependent on huge software catalog dominance to achieve profits, in fact you could probably say that at least proportionately, the discrepancy  between high and low attach ratio customers is smaller because of PSN subscription.  And to think MS made it all possible

I don't think so. Sony would rather release a PS5 than just build on PS4's HW sales success.

It's just because ... do we really believe PS4 will be "up-to-date" another 6 years? I don't. Technical progress, especially with that shift to 14nm and HBM technology, is about to put hardware to a next level. IF rumours are true, PS4K is an evident sign Sony is considering the technical downfall of PS4's hardware capabilities. I just doubt that PS4, after March 2018, will be selling even better than previous years. But I can be wrong of course.

How do you know this?