I don't think so. FreeRepublic is for the most part silent to the Leftists. You have to seek it out. Radio otoh can be stumbled upon. It can reach people that would never come to FR-many more people. That's why it is important to keep Michael on the air. And that goes for streaming audio too. It requires work to get it and very few ever do. The Leftists would LOVE to keep us on the web only. We can't let that happen.
I used to have dreams about the web superseding the traditional mediums but it now looks like it ain't gonna happen-not completely anyway.