Sounds like a fun - and thought-provoking - idea for a show, IMHO.

I think it already sounds interesting, but if you're looking for ways to attract an audience of not-just-folkies, you might consider looking at a number of pop songs that have come to be considered folk, and perhaps look at some current pop songs that might end up being considered folk in the future.

You might invite people in your target audience to submit songs they consider to be/have been both pop & folk for consideration/analysis.

Intriguing idea for a program...