There was an arstechnica piece that was a bit sooner (it’s passed the house). They said 82 million people “use AM radio”. (Most of that is probably while driving.)
The argument for it is basically, that AM-radio listeners are declining and that means stations are closing up. If they remove them, AM radio peeps “loose” the largest segment of their audience.
The “concern” is that the public warning system relies on 77 of the 4.5k stations to broadcast warnings.(emergency and weather/hazard radios)
The issue here is that it’s basically bullshit. They could just buy the towers as a stop gap until better systems come into play. (Though to be fair, as old as it is, it’s pretty much the best for that kind of alert. Might be permanent.) and its really doesn’t matter- AM radio is dying; at least as entertainment ornmews services.