"The Xbox 360's installed base is still smaller than the original Xbox's equivalent after the same number of months of sell-through. Xbox 360 sales are even more lackluster if you consider that the original was an unproven product that was trying to sell-in against the hugely popular PS2 ... In 2001, the PS2 was consistently selling-through >300K units a month, whereas the Xbox 360 has not broken 300K since its launch in November."
Those numbers suggest that initial momentum for the original Xbox was better than the 360. So could the Xbox initiative as a living room defense strategy against Sony (as it's partly believed) actually be hurting the 360's potential?