In the UK, it happens when the wrong people are presenting the wrong music on the wrong stations. Yes, I know, define "wrong". What I mean is: when people who are in touch with what's going on are presenting to people who aren't, and vice versa, on stations where the music doesn't fit in with the rest of the output, or what the management would like the rest of the output to be. BBC local stations are trying to get rid of music and become more speech centred, as happened a while back with the BBC World Service. Some of this is because, in cost cutting, a speech programme is even cheaper than a music programme because they don't have to pay PRS royalties.

Mike Harding works on BBC Radio 2 because it's somebody with a a vaguely well-known name who doesn't really know what's going on broadcasting largely to an audience who don't care much about what's going on, on a station supposed to broadcast 100% music. In that situation it's a cheap programme that ticks a few public service broadcasting boxes so it stays. No doubt the same applies with slightly different logic to Late Junction on Radio 3.

I can't see it getting any better.