I've never claimed that radio has become completely irrelevant. Things like this aren't binary, either on or off. I, others in the industry, and Wall Street analysts have claimed that radio and potentially local linear TV have no growth potential. The reason is that people under 25 don't rely on the radio for news or entertainment in the United States and various parts of Asia. Those people currently under 25 will soon become 45, and still won't utilize radio or local TV because unlike us on this radio board, they haven't grown up with radio. Now add in the diminishing of funding in the form of advertising that's fueled radio for one hundred years, and one has to question the viability of the medium over the next twenty years.
I agree that what's left of radio listening has shifted to in-vehicle. There is data to back that up. There is also data that drivers under 30 are splitting their media consumption in the vehicle with radio to include streaming services and podcasts. David could correct me; but I believe in its heyday, radio listening was split to something like 40% in-car, and 60% in-home. So now you reduce the in-home and include things like smart speakers and streaming, and terrestrial radio listening is down significantly in-home. It's safe to assume terrestrial radio listening is diluted in-vehicle because all the other smartphone options like streaming and podcasts are at least 50% or more, depending on the age of the driver. Again, this points to a lack of growth as radio listeners age out.
For years I've been involved in research, including focus groups regarding radio listening habits from consumers. The majority of media consumers don't think like you, or others on a radio discussion board. They know when they press this button or app icon, they hear whatever music or podcast. Most aren't paying attention to call letters, or positioning slogans at all. That's 1970's thinking when radio was the only game in town. It's not the 70's anymore.