Zucas, I think you're jumping to conclusions way too much. Especially regarding the 360.
Do you realize that in the holidays of 2006, Microsoft severely overshipped and filled up the retail channel? For months after that they didn't have to (and couldn't indeed) ship a single Xbox 360 to most stores, since they were filled up with 360s. This year the opposite happened, probably due in part to retailers not wanting to be in the same situation as last year. Haven't you seen all the reports and links to online stores proving that the supply issue is real? You also fail to give any other reason why the 360 is failing as a brand, or why the 360 can't keep scoring big victories against the PS3 after getting the same price cuts as the PS3 did (at least percentage wise).
Regarding the Wii, I think you're trying too hard to find an explanation for the shortages. There were some reports that Wiis were being freighted by plane instead of ship during the holidays, which effectively amounts to selling part of early January's supply during December instead. This must have left supplier's warehouses around the world almost empty, resulting in low sales during early January. As you can see in vgchartz, the situation in late January is totally different. Another factor is that Nintendo probably wanted to give Japan more stock right now, due to Wii Fit and SSBB.
Sorry but this analysis wasn't one of your best...
My Mario Kart Wii friend code: 2707-1866-0957
