On one hand, I think that Halo hit its high point 2007. Halo 4 sold quite a bit less than 3 and Reach, despite 2 outselling the original. I wouldn't be surprised if Halo 5 only sold about 7 million copies lifetime, less than any main game since the original.
That said, does the One need saving? Halo will definately help the system, Titanfall can be a killer app, and we are still waiting for the first real round of "casual" Kinect games that are almost certain to be in the works. These ought to keep the One at healthy levels. Not to mention the console is still yet to be released in much of the world. North America might be the core of Xboxland, but 35 million 360's were sold elsewhere.
I personally expect the Xbone to reach stable and healthy levels around the release of Titanfall, in less than a month.
Love and tolerate.
