kn, I really don't see that happening.
Merely because as much as an uber-game coming out would depress the market, the inverse will happen.
Lets look at it this way:
At Halo 3's launch, your going to get around 2 million Xbox 360 gamers come into stores across America. I would think that at that time, some of those 2m gamers (probably in the 500k area), will probably pick up another title alongside Halo3 if they were unable to get the CEs or such. Likewise, if inventories of non-Preorder Halo's are as bad as I've heard (ie, I've seen clerks tell them there won't be any copies of H3 outside preorders), consumers might buy comparible games (Bioshock, Gears, RSV) to stem off their want of Halo until they get more units like.
Also, if Halo3 moves alot of hardware (as I expect), it's doubtful that 100% of those new X360 console owners will fail to buy other software titles too. In the case of the pricedrop + superior Madden, as much as M08 sold so well, my charts showed there was no real drop in other games, despite Madden 2008 selling 900k units that week.
Back from the dead, I'm afraid.
