Radio slowly died due to the option of using your own media, but it's not really all that. How many stations that could be owned under one entity got deregulated in the 90s in the U.S., which was promoted of course as somehow enhancing competition, but it just lead to one company gobbling up many stations, and the advent of digital satellite radio meant that they could just end up killing off local stations anyways to stream the same few dozen stations nationwide under a subscription. Radio has objectively less variety now because of this.