Kill AM

[Weltall]

Actually there's one easy solution to that. I'm guessing you're talking mainly about car radios, since that's usually the only radio anyone actually has these days. Well, old ones all have cassette slots, and new ones all have "line in" ports. A simple adapter solution would work with that.

This is technically feasible, but not even remotely practical. I can't see many people spending $40 on an extra device just to listen to the radio. People might listen to radio because it's free and always there, but how many do you really think are going to not only pay for the privilege, but also have another device hanging out of the deck? I'd guess maybe 1 in 20.

Digital TV transitioned easily not because of converter boxes, but because cable and satellite had gone digital years before the mandated switch, and most people have one or the other. Many of them were totally unaffected by the change.

Also, a fairly large number of mid-range car stereos have no means of external input.