Retail, in general, has been dying and GameStop was never a good store to begin with. Whereas stores like Best Buy and Microcenter push you to buy extended warranties, Nordstrum and Target push you to get credit cards, etc Gamestop pushes its stupid membership card and punishes employees who fail to make their unrealistic weekly quota.
They also push customers to buy used games while offering you a fraction of the price for trading them in. With retail dying due to the rise of online marketplaces, Gamestop is dying along with it while helping to accelerate its own demise.
I agree with your collecting standpoint. Pink Gorilla is a pretty successful chain of retro games in Seattle but that niche market has little to do with modern gaming. Retro enthusiasts will always exist but collecting for mordern systems is fairly pointless.
RE: Are video game stores an endangered species?