The point is that it's not the delivery system that matters, it's the content. If the content you're delivering is available easily elsewhere, prepare to be replaced. If you can offer curation and content not easily available elsewhere, and you control the amount of disruption caused by commercial content by both limiting minutes and providing compelling and entertaining commercial messages you have a chance to not only survive, but thrive.
If all you're doing is running syndicated pap, listeners don't need you. That content is available world-wide.