That's just silly. Of course, it was Amazon that took Sagans of investor $$ (you know, billions and billions) and used the cash to drive down book prices across the country. Barnes and Noble is the only chain survivor. The local Mom & Pop shops have made something of a comeback.
But the same thing, writ large, has happened to music stores. GC may not be the best store ever. But they're actually pretty good. I've used them for drums and PA gear plus guitar toys (pedals, cords, strings, etc., but no actual guitars or amps). They have decent keyboards and acoustic guitar departments, too. But online is killing brick and mortar, slow and steady. COVID has sped up the trend a lot. Even on non-depressed main streets, there are a lot of vacant shops. And they are not coming back.
Interestingly, it was GC sister company, Muscian's Friend, that became the blockbuster online vendor. But the online marketplace for music gear is healthier than books and most other stuff (Amazon, Amazon, Walmart, Amazon, ...). We have Sam Ash, Sweetwater, B&H Photo, a million independent boutique vendors, Reverb, EBay, CL, etc. It's gotten to the point that it's too hard for even GC to keep good stuff in stock. So why bother?
So, even if GC survives this round, I doubt they're viable long term.