Part of the point is compliance. If we were to decide that all homes must have an AM radio, you're not going to get great compliance. I would likely put off buying one because it doesn't feel necessary "right now", and I'm sure if there was a requirement for builders to actually build the radio into the home, old homes (read: nearly every single current home) wouldn't be required to have a retrofit.

> I think it would be more appropriate to tell people to pack an AM radio in the disaster bag we’re all suppose to keep in the trunk.

I don't have a disaster bag in my trunk, and I know exactly two people who do (they are volunteer SAR people, so big surprise there). You'll get very little compliance for this requirement. And if you want to try to enforce compliance, doing so will be incredibly expensive.

And that brings us to the other part: cost. Every (or nearly ever) car out there in the US today already has an AM radio, from my 2-year-old car to some restored antique from the 1960s. Most people don't have a standalone AM(/FM) radio these days, and basically no one has one built into their home. Can you imagine how expensive it would be to require all homes in the US be retrofitted with a built-in AM radio? Even requiring homeowners to purchase a standalone AM radio would be massively expensive. Especially when compared to the cost of $0 to require that all cars have them in it... because they already do! And for car makers planning to drop the AM radios: it will be at most a few tens of dollars added to their cost to continue to include them. A cost they can continue to pass on to their customers.