It honestly would not surprise me. At all.
First, the pickins' of retail modern terrestrial home stereo/portable radios is mighty slim (Yes, you can still order a nice new radio online. But I'm talking about something one would need now. Like in an upcoming natural emergency or a big local sports game and there isn't a thrift shop for miles) And the ones you do find are 25-30 year old stock that have a half inch of dust on the blister packaging are of utterly terrible quality. (I don't know what a Lenoxx Sound is, but I just couldn't blame Annie Lennox for calling her lawyer if she heard one of those things.)
Second, Cars. Car manufacturers want to get rid of AM. They also want to get rid of FM too. They see streaming as the ultimate replacement for broadcast radio and they may be right. Consumers want brand new shiny bleeding edge tech. Not dinosaurs like HD Radio. Or anything outside of the car manufacturer's remote control.....
Third, The Junk Heap; In 2019, at my oldest daughter's first job, she called me over to her work because she wanted to show me something. I drove over and there were two giant boxes packed with assorted radios; Clock radios, portable radios, table radios, pocket radios, a couple novelty radios, personal headset cassette radios. Both with 8x10" sheets of paper taped to the boxes with the word FREE printed in bold Arial font.
There was nothing wrong with these radios. They were all perfectly good. A few nearly mint condition, including a mid-'80s vintage GE Mono AM/FM Portable Radio/Cassette, which I quickly snapped up. There was just too many of them and nobody was buying them at any price. There was literally no turnover in radios on the shelves in years. And the back room was already getting crazy and on the cusp of illegality with other things coming in. But this growing collection of unmovable radios was getting beyond noticeable. Something had to give.
Her boss explained to me that the whole thrift shop industry had been overwhelmed by radios people were getting rid of. It was nationwide. And her story corroborated with what I (and maybe even you) had been noticing in the late 2010s while weekend bargain hunting the thrift shops, flea markets and people's garage sales; There were a lot of second hand radios for sale. Cheap. And radios can still be found cheaply. But as we speak, cars with old radios are getting crushed, electronics are getting recycled. It's only a matter of time.
And in spite of the still cheap availability of terrestrial radios of any sort, TuneIn and other stream aggregators are becoming the modern replacement for radio for those under 50.
Also with streaming, Stations, even advertisers could potentially see in real time who's tuning in/out, how long people are tuned in, etc.
Yes, listeners in other markets don't count.....Until they do.
And they eventually will.