This would not be the first case where research has indicated a format or strategy that did not work in the real world.I agree. My bet is they've probably got a study going as we type. But as has already been established: Either way, they need to find a relevant AM show, and be ready to promote outside of the station.
A great example would be in the era of the 80's and 90's when a number of stations had late night sex-talk shows. They got huge numbers. But research would reveal that "oh, no, I'd never listen to that kind of show."
In a one-on-one interview project with listeners to a station with that kind of show, I was speaking with a 40-something woman. When asked about that show, she said, "that's horrible. Last night they were talking about oral sex. And the night before they were talking about group sex with three or four people. And before that, on night last week they were talking about exchanging partners, and, even worse, before then they talked about anal sex..."
In other words, she would not miss the show. But she would not admit to listening to it.
That's why this kind of research that goes beyond whether they like "Go Your Own Way" is dangerous and requires very careful phrasing of questions and a very good interviewer.