I find it slightly confusing that the current 95.1 would expect to increase listenership by word of mouth. Their current format is aimed at an older and different demographic than their previous one, so how (or why?) would they expect the former listener base to ‘spread the word’ in a positive way about the new format?
What's confusing? The old audience is gone and has been for 6 months. Anybody left either likes what they hear or don't have a choice in what station they are listening to. So you can presume that at least the first group of people would tell their friends that they can hear old Chicago records on the radio again and might even be excited about it.