It's not about the codec or bitrate, it's about error recovery. The scenic Norwegian mountains are not kind to radio transmission. FM fidelity was achieved by

It's not about the codec or bitrate, it's about error recovery. The scenic Norwegian mountains are not kind to radio transmission. FM fidelity was achieved by building one transmission tower per 2000 inhabitants. At a guess, FM is really being switched off because noone wants to pay for all those transmitters any more.