More people are just downloading games directly (With cloud and large local storage now cheaply available) the secondary market is shrinking fast!
I stopped in my local resale shop when CDs were starting to wane, and asked them what they thought. They didn't think much of it at the time, well, i went in there last week, and the racks and racks of CDs they had up last year were now just a small corner in the store. Games and movies will be following very quickly.
I admit, I don't only any gamestop stock, but i am thinking its a sure thing for trying my first short!