Xbox One should be at 12 million by the end of 2014
Wii U will be at 10 million by the end of 2014
Xbox One should be at 24 million by the end of 2015
Wii U will be around 13-14 million by the end of 2015
Xbox One will have a lead of ten million by the end of 2015!
That's one optimistic prediction you got there. Let me fix that with more conservative numbers.
Let's take the 7 million you have and chop it down to 4 million. I expect that the XB1 is at 5.5 million now. So, 5.5 million with multiplats and some exclusives including Halo: MCC. Let me tell you why I think this is a conservative estimate: Halo MCC will dilute the impact of Halo 5 next year. That makes some 9.5 million XB1s. Quite a number we have there.
Now, let's cut down XB1 to just 8 million next year. Why, you ask? By what you're thinking, this seems like a conservative estimate. But, hear me out. The effect of Halo 5 will have been diluted by the success (or failure) Halo MCC will turn out to be.
So, as a compromise between our sales predictions (I expect 16 million for XB1 by end-2015, but I'm still working out the kinks in my prediction), let's say 18 million for XB1.
10 million is conservative for Wii U. You're underestimating the impact Japan has on the baseline. They'll add, like, 400k sales by year-end, but don't mind me :p
Considering the games coming out for Wii U (and Smash 3DS effects), I expect 4 million between now and year-end. I'm thinking of having 6.5 million Wii Us in households right now, so 10.5 million.
2015? I can draw up a prediction for you. It's called having a 60k/week minimum baseline all year round (overall average 90k/wk). That leads us to roughly 5 million Wii U units sold. So, uh, I think we'll see 4.5 million units. That leads us to 15 million.
I still hope the Wii U sells better than XB1, until Zelda U drops.