[neverending]

Ferret- you outline an interesting story- I want to find out how it ends! However, you make some assumptions that I'm not sure are logical, such as this one:

Yet another problem to conquer is the characters, for without speech of some sort it will be next to impossible to give them real depth, with actions doing all the talking for them.

Remember- yours is a world where sound doesn't exist. Don't you think humankind would have developed some kind of method of communication? Certainly they'd be able to impart complex emotions and thoughts in some way. What is it? The human face is quite expressive. Expert actors can impart much with a look or expression- ditto with a gesture, or body posture. Have you watched many silent movies? It was a good answer, but not great.

Alky-
I agree with Doc. You were asked what you would do to make your station popular. I don't see that in your answer. Your appreciation of silence in the medium is notable- but you make no mention of sound effects. Sound effects artists in OTR were quite creative- a prime example is your example of War of the Worlds. They went to great lengths to find original sounds for the alien creatures ships and movements. The power of a simple sound like a creaking door, or the horrible sound of an axe being lodged into a human body- all helped radio dramas gain their effectiveness.
What kind of shows are you going to program? How and why are they going to be popular? What will be their particular strengths? Additionally, in a world with no visual media surely there would have been more resources devoted to developing new audio technologies, methods and soundscapes. How could you have benefited from that- or even pioneered it?
Another good, but not great answer.