This is an unconfirmed rumor. The xbox won't be out until 2014 so GME has 2 years until that comes out PLUS several years of legacy used sales of xbox 360 used games since the adoption curve of a new console takes years. There are all positive tailwinds for GME. So even if MSFT does somehow stop used games from being played GME has such a low multiple that it is already built in if they lose some used game sales from xbox. They would still however get new game sales and they also have all the other platforms plus the growing ipad/iphone/ipod trade in business. I'm taking my iphone version one to gme for credit this week!
apprcciate the response very helpfull. I thought I should add that I heard this rumor on NPR this morning on the news. I wasn't listening close enough to know if they stated this as fact or speculation.