My biggest concern about this "no used games" thing is that, while yes Zach it will hurt Gamestop, they will still outlast and push through while every independent and locally owned game shop bites the dust. The simple truth is that, the way margin is set on new games, it's virtually impossible for game only retailers to turn a profit with out a robust used games business.
If this does come to pass, expect all of the local shops and indie online retailers to die long before Gamestop. That's not something I want to see.