As it stands the Wii is 10,141,376 ahead
Last week 360 outsold Wii by 60,991 so at this rate it would take it 166 weeks (or just over 3 years) to catch it up.
I don't think the Wii is gonna get back above the 360 in the americas again and I also think it'll outsell the Wii in the holidays (yes I really do).
I also expect Nintendo to announce the Wiis successor very soon, whereas Microsoft and Sony will want this gen to last as long as possible so I dont think its out of the question for 360 to have at least another 2 strong years on the market.
So what do you think? Can it do it or will the Wii hold on?
UPDATE:
As of July 3th the Wii lead is now down to 9,003,113
With the news of WiiU, a pretty ineffective Wii price drop and the 360 looking to become America's legacy system I think it's now even more likely that the 360 will one day become the top selling system of this gen in America!