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I think it really depends on when the successors to both are launched and how the transitions are handled. Microsoft pretty much abandoned the Xbox when the 360 turned up, and if they do that again then I think the 360 will stop gaining on the Wii one the Nextbox is released. If that happens within the next 18 months, then I think the 360 will top out at around 90m units, while I can't see the Wii passing 110m. If Microsoft continues to support the 360 well for an extra year or so, I think it'll get to 95-100m.

PS3 could pass the Wii eventually if it markets the PS3 as well as it did the PS2 once their successors are/were released. I mean, there's a small chance that even the PS2 may outsell the Wii in one of the years ahead the way things are going.