Since people had lack of faith that PS3 was even going to reach 30 mil by the end of the year, I'm going to take a whim and say by november next year PS3 would have overtaken 360 in sales. It will probably be ahead by a million then just take it from there.
"Life is but a gentle death. Fate is but a sickness that results in extinction and in the midst of all the uncertainty, lies resolve."