There won't be any new radio stores, except possibly boutique online ventures tailored towards radio geeks.
Most people under age 20 have no (or little) idea what a radio is. They get all their entertainment via smartphone. Which makes it ironic that Sprint is reportedly buying many Radio Shacks.
You can still see radios for sale in a store here where I live. The local box stores have several -- usually several clock radios and a CD boombox or two, an FM radio with docking for your IPod or whatever, and 2-3 headset radios.