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Shutting down low to medium powered AM Broadcast Services in densely populated city areas should not be too much of a problem. AM is prone to interference from many electronic devices such as computers and even heterodyne tones from switchmode power supplies. However high power AM Broadcast Services, such as transmitted by the ABC, are absolutely essential in remote areas of Australia, and I assume in many other countries. Audio Quality, is of secondary importance. However News and Weather information is vital when you are traveling in the outback. Proposals for Digitizing AM Services, appear to be silly, and a total waste. In addition, it is unlikely that moderate cost receivers will ever ba available.
Happy to discuss my views on the subject.