at the very least, not trying to convince customers to go with a used copy over a new one three days after launch just to save 5 bucks
Any how many games are being traded in within days of release? The biggest sales period are the first two weeks, maybe three. If there are so many used copies coming in and going out, that's not GameStop's fault. There doesn't need to be a restriction. For $5, I'd be more willing to splurge on a new copy anyway. I'm sure many do too.

And even if they're buying used, there are other avenues of revenue now (DLC, download spin-offs, gamerpics) so the point it moot. If used games are such a concern, then smaller companies would be fighting them too, but they're not.

GameStop hasn't changed anything. Gamestop has grown alongside the industry.