When whispers of s4 started I was hoping for a prequel, but I'm liking the idea of it being done in audio more now. There would be far less budget needed to pull it off for a start
I am a great fan of audio for a number of reasons. First, when I was younger, my bohemian parents didn't really believe in TV so I was brought up on radio 4 dramas and the like, so there is something primal for me about an audio drama. Secondly, as Sandi rightly states, it doesn't need a big budget so the stories can be that much more epic. You can have trips to India, Egypt and where ever and you are not tied in by location shoots. Third and perhaps most importantly, it is a very intimate way of storytelling; the listener needs to concentrate, it can't just be a passive experience, the listener needs to fill in the colour and texture of the play. Correspondingly, this imposes a duty on a writer, who needs to be that much more thoughtful when writing the dialogue. Finally, there are some wonderful voice character actors out there who can really bring this to life.
