While it is true that revenue ultimately wins the day, there is generally a strong correlation between ratings and revenue.
Yes but...ratings are only useful as a tool to earn revenue. All infomercial or home shopping TV channels can be profitable while having miniscule if any ratings.
I think we're seeing the very beginnings of Radio having to reinvent itself. Jukebox-type stations are going the way of the landline telephone.
Broadcasters will have to find a way to keep listeners engaged, and talk/sports is a great way to do that. Oldies/Classic Rock is feeling the damage done by beating the same 300 records to death for the last 10 years.
Feel free to tell me I'm full of it. I'm married...I'm used to it.