With halo 5,350 in us all year with a possibility of 300at the end of the year, Gears collection (most likely), and all the other exclusives why not? The Xbox one was 500 for like half of the year last year. 

Unless it gets a holiday price cut that puts it sub $250, no.

Because of the PS4.

It is possible but we will see.

Out of curiosity, what is your PS4 prediction?

The XBO was 349 (in the US) in the two single biggest sales months. November and December account for a huge part of console sales. I really don't see this as likely it all.

I personally would say 25m is the absolute max, 20m is certain in my opinion though

Reason being

New pricepoint: XBox only spent Nov and December at its 349 pricepoint, the majority of the year it was either more expensive or equal to PS4. We all saw how its sales exploded in November, obviously it was partially down to the big games (Halo MCC, COD, GTA)  and Holiday bump, but we saw its sales jump proportionally bigger then the PS4's due to the new pricepoint. On that basis alone its reasonable to expect things to be up YOY, throughout the majority of 2015 it will cheaper then the competition something Xbox was not last year.

Xbox is out in all regions, unlike last year where it didn't launch everywhere till Q3. A small but notable add to its sales being up YOY.

Big holiday momentum. We all saw how much big microsoft numbers were in Q4 and no one predicted them to be that high, it sold 6m in the second half of 2014.That is going to have a trigger effect on how it does during the beginning of this year, we all know that people don't just buy systems in a isolate manner they get what they're friends have. With the gains xbox had recently, it should snowball into better sales going forward, the system now has a positive buzz surrounding and is no longer the flop system with DRM.forced kinect etc. Of course with  COD/GTA/Halo/AC Unity/ Dragon Age/Far Cry all continuing to push hardware sales for the next month or so, I think its sales will be strong in Q1. 

Superior software line up over 2014. Last year Xbox Q1/Q2 had Theif (cross gen), tomb raider (a year old remaster), titanfall (cross gen) and Watch dogs (cross gen)at the very end of May. Compare that to this years line up consisting mostly of next gen exclusives: Dying Light, Evolve, Final Fantasy Type 0, Witcher 3, Batman Arkham Knight, Dead Island 2 and cross gen titles like Battlefield and Mortal Combat. In what world would sales not be up significantly at comparing the line ups. I'm assuming Evolve and Witcher 3 are big hits which isn't garunteed but if you want to keep up with gaming in the next few months you're gonna need either a PC, PS4 or Xbox One somethin that wasn't the case last year. 

Superior fall line up. Quantum break, Halo 5, Tomb Raider, Forz 6, The Division, StarWars Battlefront 3, Hitman (all next gen exclusives- probably plenty more yet to be announced, maybe even COD? unlikely but possible). I expect Microsoft to be just as competetive as they were this year and hit the 299 pricepoint during the holiday. 

I think across both PS4/X1 sales will explode, the most simple reason being developers have finally moved on from last gen so gamers will be forced to aswell.

And? Ps4 won't stop Xbox one from selling better than the year before. Ps4 sold 14 mil it's fast year at 400 yet you underestimate the Xbox one So much that you don't think it can do the same with a better exclusive line up than ps4s first year and a much cheaper price. 

The $350 is according to MS only for a limited time as well.

Also you should really explain how you think that whole thing is going to happen, where is it supposed to sell all these units? Cause outside the US and the UK the sales of the system have been miserable, do you expect sales to pick up in those regions or do you expect most of those 14 million to come from the US and UK? How is this going to work?

Xbox One was $320 + $50 gift card making it $270 with 3 free games.  Why do we keep forgetting that?

A PS4 price drop would do just that.  PS4 has the the whole world to sell well, meanwhile the Xbox One has the US and UK.

35 mil.