Games wont be sold out for the most part. If you go to a store and they are gone, go to another and you'll find it.
Atleast you have a system preordered. I have it the other way around. Games preordered and No system. I took in a ton of dvd's and got enough for CoD 2 and Play and Charge kit.
The reports Im getting from local stores paints a dim picture for launch day around here. Stores getting only 6 to 10 consoles, and most of those being Core because the Premiums went to preorders??? I wont believe the doom and gloom until I see it for my own eyes, but Im ready to come home with a Core if need be.