Another off-topic post but for historical accuracy …
Credit PBS (Corporation for Public Broadcasting/Public Broadcasting Laboratory) -- first true, long-form, unscriipted, roughjly edited shows was a series called "An American Family" of a film (not tape) crew followed the Pat Loud family for several month, boiled down to eight weeks I believe. Came out during the shooting her husband was having an affair, her son was gay, her daughter was pregnant … a fine protent of what the format was to bring to American homes.
But on topic, to me it seems corporate culture pulls the strings for stations these days. Sure, there may be local PDs and GMs but they know if they step over the lines the suits in the ivory tower shrink back from, they are toast. So everyone plays it safe, just doing what brings in the money. The PPM numbers may be there, but I would venture if you did a strong intake interview with a listener, you'd find they don't really give a hoot about the station, just the music, and then only about the music for a short while, until it gets old and "boooorrrrriiiinnnngggg!!!."
And that formulaic mold is visible in TV too. There are very few innovations in the entertainment field now, and likely to be less, as devices are created whereby one can develop one's one play and view lists, and time shift galore. Someone else may have said it, but "AM is dead, FM is fying. Love live the Web."