It's hard to sell with shortages. The demand is high but Sony isn't there to meet it. People will either wait or buy another system. I just hope Sony mass produces in March because thats when Final Fantasy is out, and thats a pretty big key PS3 item. Same with God of War 3.
So, 360 will obviously have a good shot and taking this lead beyond 2011 with Natal and Sony's shortages. That is unless Sony cuts to down to $200... then MS would be in trouble.
It's just that simple.