I think its funny that they feel the need to throw an opinion out there like that.
First off, they clearly have a huge stake at hand. If the next gen consoles don't allow used games, then there goes a TON of there business. Secondly, they are just plain wrong. Sure, there will probably be some hesitation, and it may take the consoles a little longer to pick up steam than it did this generation, but people will buy them. It may be a culture shock of sorts but people will adapt.
People will not just stop playing games because they cant buy used. You can say that a lot of them will move to PC, but the argument there is that PC is already pretty much doing that same thing. You cant buy a game on steam then lend it to someone. Yes, I know games are often dramatically lower in price on steam that what the consoles stores offer, but the point is still valid.
I think that the next gen consoles will have better stores, ones that allow all games to be digitally downloaded, and have sales much more frequently. If companies know you cant buy used then it would give them more incentive to lower prices of older games. Currently it pretty much does no good to lower the price of a game because stores that sell used games lower the used versions down to compensate. Its kind of a no win scenario in that regard.
Anyways, TL; DR: Gamestop is wrong if they think people wont buy next gen consoles blocking used games, and LOL at them for saying that. Shows how scared they are of a future where such consoles exist.
Honestly, I wouldn't have made the topic but I just noticed the Gamestop comment. I found it completely hysterical that they come out and say that, as if they don't stand to lose a TON of money if it were to actually happen. Really, all it would take is each game to have an activation code to play the game. If you don't have a code, sorry but you can buy one from the consoles store for $20 or something. They already do that with some multiplayer games, I can see it spreading to include all games. The console themselves may not block the games, it may very well be the publishers with there activation codes. I'm not saying I'm really for or against the idea, just that it is a possibility...