4 to 4.5 million by year's end is my prediction.
I stated hear why: http://gamrconnect.vgchartz.com/thread.php?id=209218&page=1#

5 million by end of year... yeah okay..... that could happend, tiny bit optimistic.
7 million by end of year? I dont see that happending.

Pretend by then the Xbox One is at like 16.5m+ users or something.

7million copies sold would be a attachrate of 42,4% of the user base, you cant do that in 2 months sales..

To be honest your figures are pure optimism. Halo is big but not big enough to hit those numbers by the end of the year. I won't even entertain your hardware predictions for the xbox.

6 million for sure

I think this will be one of the worst selling Halo's, so have to disagree unfortunately.

I think it'll do around 4m this year, around double that LT

Halo 3 had something helping it back then and that was a cheaper console and alot of previous PlayStation owners switching over which caused such huge numbers. Now Xbox isn't as popular like then and a lot of Xbox owners have moved back to PlayStation.

It'll sell a lot for sure but there are also a lot of other big games this year with Star Wars, fallout, cod that could take away a big chunk of its sales. Halo 3 didn't have competition like that back then.

I think a healthy 4.5-5 million sounds about right.

Wow! Thats like 70-80% of XONE owners!

Not a chance. The userbase for XB1 is very low.

I expect Halo to have pretty high attach rates now that the mainstream consumer has moved to PS4 and X1's demography are mostly fans and those who bought it for exclusives. So I don't think small userbase is a very strong argument.

Thats what im trying to say. Most people who own the x1 are hardcore fans since a lot of people are now on playstation.