360 to regain all it's lost NA lead from Nintendo

[Gamerace]

Next-Gen make a very detailed analysis of the November NPD report and noted that within a year the Wii has cut the 360's lead by a 1m units.  However at the end of the report they note due to Wii shortages the 360 could gain that entire amount back:

The Xbox 360 may extend its lead over both its competitors in December 2007 and January 2008. More specifically, Wii sales during Holiday 2007 are reminiscent of Nintendo DS sales during Holiday 2006: extraordinary sales in November and December, with almost no stock left in January and finally a rebound in February 2007. Should the Wii stock be constrained to near 1 million units in December 2007 and then very limited stock in January 2008 as the market restocks, Microsoft will have an opportunity to regain as much as a million units on the lead it currently has.

For the full article: http://www.next-gen.biz/index.php?option=com_content&task=view&id=8374&Itemid=2&limit=1&limitstart=1 

It's 7 pages, not for the faint of heart or time constrained.

Can Microsoft gain it's lead back?  Will this become a yearly event preventing the Wii from ever catching the 360 in NA? Thoughts?