I think it's pretty safe to assume the Wii will make it. It only has ~4M to go. It should have an okay holiday this year, with probably a $99 price point, so should cross 100M mid-late 2013. I see it ending ~102-105.
As for the PS3 and the 360, I think the PS3 has a shot at 100M, while the 360 doesn't. Sony should see a nice boost this holiday from the upcoming Slim launch and accompanying price cut, while MS may see a decent boost from the $99 deal at a few stores. I also expect Sony to continue to supporting the PS3 after the PS4's launch, while I expect MS to switch over all its efforts to the NeXbox much quicker. The PS3 is also more popular world wide, which increases its chances at continuing sales, especially in developing countries.
