As already mentioned; Radio Disney has already played that game. First was intended as a 24/7 audio extension of the Disney brand. Then after that didn't work, to find advertisers/agencies who want to reach the young demo. That was a struggle with little result. Finally, intended to purely promote Disney theme parks, movies, and merch. Once it was discovered that few kids actually listened, especially when on the stable of crappy AM stations, the whole thing started winding down and stations liquidated.
Getting back to the original topic; What happened to BM? Age.