Contrary to what you keep regurgitating, the VAST MAJORITY of talk stations, especially the biggest, did NOT do anything to avoid the current situation.
First of all, your original post wasn't about the "vast majority," but the entire format. So now you've backpeddled a bit in the light of conflicting information.
The other thing is that up until about two years ago, that "vast majority" you talk about also had pretty good ratings with conservative talk. To move away from it would have been stupid. The "Rush rabbit hole" you talk about served them well for an entire generation. That's not bad for something you abhor.
But still, as I've continued to point out, and you refuse to accept, there were many who didn't sit back and do what you call the lazy thing. So you're wrong about that. They didn't stick with conservative talk because they were lazy, but because it was successful, and what their audience wanted. Then when it wasn't, they threw out the syndicated screamers, and found success with local talk. It's working well in lots of places, as I've already pointed out.
It was changed due to an ideological concept---not a reaction to failure.
Ahhh the old copout. There's a right wing conspiracy in radio ownership that forced conservative talk on its listeners. Next you'll lecture me about Mitt's role in Bain and how he masterminded the whole thing. Go back to your basement bomb shelter. In 1995, the old talk format you loved was dying. Not in the ratings, but from old age. Larry King, once the King of the Night, was the canary. He realized it and left for TV right about the time Mainelli got fired. Michael Jackson retired. The old guard was leaving. The same thing is happening now, 25 years later. And not because Obama is out to get Rush, but because everything has its time, and after 25 years, it's time is usually up. Not because of ideology, but because the fad is finally over. The only problem is that AM radio is also done, and there's nothing anyone can do to save it.