"Has any game system in history suddenly had a 400% sales spike after the Christmas holidays ended and then kept that same momentum for 4 more years?"
I think that is not the point. In Dezember the PS3 will do at least 1.5 mio so there needs to be no 400% spike after the holidays. You cannot take a per-month approach to this chart since they clearly only made projections for the whole years without taking seasons into account.







