The days of used games is nearing it's end as the industry converts to digital. This is an interesting way for Gamestop to prepare.
If by "nearing" you mean "when us Gen X-ers and Millenials are all old and grey," then yeah, maybe. The demand isn't there yet. Not even close. According to a DFC Intelligence report on 2014 sales, only 12% of AAA unit sales for console games are digital, and of those 60% are from bundles, meaning only one out of 20 AAA games bought on their own are digital. That's not much. The vast majority of console gamers want physical. We want to actually own our games and enjoy the benefits said ownership confers, including the first-sale doctrine that allows us to collect all those old cartridges. Also, the infrastructure really isn't there to support digital. According to the most recent data I could find (about a year ago, give or take), some 30% of U.S. households lack broadband (based on the former definition of "broadband" as speeds of at least 4 mbps), and 76% lacked speeds 10 mbps and faster. Incidentally, as of the end of 2013 about 40% of 360 owners worldwide were not connected to the internet.
Print was supposed to be dead by now. Paper-and-ink books are thriving and e-book sales are stagnating. Blu-ray was supposed to be dead by now. Sales are growing. Hell, wasn't TV supposed to have killed the movie theater decades ago? An impending all-digital future isn't quite "we'll all have flying cars by 2015" territory, but it is pretty far out there as predictions go. Between the lack of demand, the infrastructure concerns, and the fact that all-digital would require them forcing it (something the music, movie, and book publishing industries have yet to do) would create a lot of ill will, the idea that discs (and cartridges for portables) are going away any time soon seems rather outlandish. A lot of people have predicted that either next-gen or the following gen will be all-digital, but, like predictions that last generation was supposed to be the last, it'll end up in the dustbin of failed prognostications.