Hmm, there are two outreaching possibilities I see, one is that the X360 continues to outsell the PS3 through the year, but rather slowly.
For that scenario the maximum gap will extend to about 11 million, and the minimum will obviously be the 8 million the year starts with.
-----
Another scenario sees the PS3 slowly catching the X360 in weekly sales, before outselling it weekly, and thus decreasing the gap, and then managing a good Christmas period making some decent ground on the 360.
For that I would think the maximum gap would extend from now until March/April up to about 9 million, then as the PS3 comes back the gap could diminish to as low as 6 million.
-------
So I guess it depends on the scenario that play out, personally I think it will be something in the middle, in that the PS3 will only start outselling the X360 later in the year, for which I see the maximum gap being about 10 million, and the minimum gap will remain the 8 million the year starts at, although the gap at the end of the year will be between 8 and 9 million.
