As someone else mentioned, you buy a telescope (or any type of electronic gadget) online, another store, etc. So you need a cable, or connector...Sometimes you can't wait a week to order online for instance. So where do you go...Home Depot electrical aisle...nope...Staples or Office Max...nope...Ace Hardware...nope. You'd think some existing business could absorb something like this into their business model. There is a market for connectors and cables and such. Not enough to support an entire franchise anymore though. I think the bigger scenario is that the majority of consumers (customers) don't "tinker" like pretty much everyone on this forum. Smart phones, tablets, and all of the related accessories are sold at WalMart, Target, etc. Aside from RF connectors, components, scanners, and all of the other things that you and I like, everything else at Radio Shack can be found elsewhere. Even dollar stores sell ear buds, power cords, phone cases, etc. Electronic kits I've seen at some mall toy stores at the holidays.
Consumers have changed, times have changed too. Few people tinker anymore, they want "apps". Few people put together a component stereo system in their homes anymore.(RS sold stylus "needles", cassette head cleaners). Hardly anybody puts a new stereo in their car (they have the dealer do it if the car doesn't already have a great radio). TV comes thru a cable now so who buys: Masts, rotors, antenna, F connectors). You get the idea.
I'd love to see a spreadsheet of what items they do sell now per month. there has to be someone in that organization that looks at what goods are top winners. I'm sure it's a pretty narrow segment though, and not enough to float the entire business.
I have a story to share that I think explains RS dilemma: I participated a few years ago in my son's Webelo's pack night. "Technology night" or some such thing. Well I made a simple spark gap transmitter from an old 12vdc relay wired like a buzzer, and brought a transistor AM radio to hear the Morse Code. I had planned to emphasize Morse Code a bit, show the code key, explain how the 12v battery was wired to the relay....nope they were more fascinated by the AM radio! They never saw one before...these little kids are being weaned on mom and dad's Smartphones, that's all they know. They were amazed you could get music for free. The DTV demos I've setup using a converter box and an antenna get similar reactions too from adults...you can get free TV? There's a lot of social pressure on consumers to be comfortable with whatever the latest got-to-have-it technology is right now. They will follow like sheep towards whatever is the hot thing right now. Granted all the new tech around us is pretty cool, and really doesn't require a lot of know-how to get it working....which is the downside.
From my own selfish wants...I'd like to see some kind of variant of RS somewhere. I like the idea of being able to buy resistors, some PC board, BNC/RF conns, relays, scanners, CB, coax cable, etc. Home Depot and Lowe's have been successful with the "do it yourself" business model...the idea that consumers can go buy stuff to work on their own homes. But i suspect that market is bigger than our segment of electronic/scanner/radio enthusiasts. So I would be curious if the parts and radio segment might find it's way into that kind of market place. If not, then online shopping will probably be where we all go instead of Radio Shack anymore.