Books have been on the radio for a long time. Often they are read through with music played to indicate scene breaks. My favourite novel, The Daughter of Time by Josephine Tey, was broadcast like this. (It is repeated every so often on Radio 4 Extra so so listen out for it. It’s a cracking story and the music is wonderful).
And of course books make for good adaptations – the right sound effects and music and no expensive sets or location costs! Radio has many advantages over TV here.
Authors of course welcome the chance to discuss their books. The problem though is it is the big name authors who get on to Radio 4 etc so other writers need to focus on alternatives. With the ready availability of podcasting as well now, there’s another avenue for writers to explore whether they set up their own or are guests on them. Oh and don’t underestimate the hard work that goes into running a podcast or preparing well to be a guest on one!