BULL.
Consultants and programmers have limited the input of jocks so severely in most dayparts that they have little opportunity to add value to programming. When they're given the opportunity - like on morning shows - the value goes up exponentially.
The homogenization of radio is directly attributable to short-sighted management who consider jocks and expense, not an asset. That's why you see a dozen 4-share radio stations in major markets that used to have dominant stations and also-rans.
I know, you'll try to tell me that music formats beat personality formats, and that's why they've become predominant. I'll tell you that it was a conscious decision by upper management to devalue jocks that made that happen, not a lack of talent. Formats were - and are - locked down to the point where there's little opportunity to entertain. It's hard to make a difference when you've got four talk-overs an hour.
Corporate will reap what it sowed. The next generation sees radio as an iPod that it doesn't have control of. Why bother with radio when they have an iPod that they DO have control of?
It will get very interesting when Internet radio becomes widely available through a ubiquitous wireless connection. If artist fees don't shut it down, traditional radio may be in real trouble.