I suspect GameStop knows this.

All of the ones near me have reconfigured their stores to emphasize game and geek-culture related merchandise and memorabilia instead of games.

I think there’s probably still a decent market for used console games from the 8-bit and 16-bit eras, and all the generations of Gameboys, and of course they could sell both new and used consoles and accessories. I think they could survive in these niches if they consolidate their stores a bit, as they have far too many locations given current market conditions.