To be fair, it isn't just Radio Shack. RS has managed to hang on while most of the competitors I remember from the 60s have died off. Allied Electronics, Lafayette radio, Olsen electronics, all gone. RS has changed, but it still hangs in there.
There is a ham radio store here that I have been going to since the 50s called Amateur Electronic Supply. When I moved out of Milwaukee in the late 70s, this place was the gathering spot for hams. There were always 30 people in the store. A novice could get an education there from the customers. There was a large stock of components for homebuilding and repair. They had racks of used equipment so a kid could buy something of quality, although a bit obsolete and learn and grow. Now when I go back, I am the only one in the store. Two clerks are mostly on the phone or processing web orders. They mostly stock cheap Chinese radios, with some familiar brands (ICOM, YASEAU, KENWOOD) mixed in. All is prepackaged and heavily integrated. No room to modify, experiment. Thus no customers just hanging around, and it looks like just another dying hobby. I most recently bought a 2 meter mobile to use at car rally events, but frankly I only turn it on a couple of times per year.