It doesn't invalidate your point...it may even reinforce it...but Limbaugh bombed out of Kansas City in 1984 when KMBZ fired him.
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(Synopsis: News/talk station KMBZ fired Rush Limbaugh, 33, whom it had hired when it adopted a news/talk format. At first, he was the afternoon news anchor and did commentaries. He subsequently replaced longtime station host Curt Merz, who was fired. Limbaugh then became the afternoon host, also continuing his commentaries that were often politically conservative. In the preceding weeks, the general manager of KMBZ, Russ Wood, resigned, and the director of news and programming, Phil Mueller, was "released from his position".)
(Also note that the editing on the story could have been a little better: the story implied that Limbaugh replaced Merz before Limbaugh even joined the station.)
(
Kansas City Star, September 25, 1984, page 2B)
Shortly thereafter, KCMO tried a confrontational talk format not dissimilar to what you hear on AM talk radio today. It bombed. As I mentioned in another thread, Kansas Citians can be slow to embrace new concepts, and confrontational talk went against the prevailing culture of the area.
Which reinforces the point that, if you're going to try something different, you'd better know your audience before you launch your effort.