I would be interested in knowing the difference between WLS-FM and K-Hits in the money demos. You can do well 6+ but have quite an older audience. 60s still has a lot of audience, but just not in the money demos. So, it would be interesting to know how much of WLS-FM's audience was over 55 prior to the recent changes and to see if their 6+ drops much. I'd guess they were not doing well in 25-54.
They are icons, no doubt, but I can't help but wonder if the audience for the 70s/80s classic hits really relate to guys like Dick Biondi. I agree that they aren't associated with the music the station is playing, really.
WLS-FM has eliminated much of the disco/pop/R&B/new wave-type material and is now relying on most rock and pop/rock. K-Hits has more of the Commodores, Spinners, KC, Stevie Wonder, ABBA, Bee Gees, Earth Wind & Fire, etc. type of classic hits. Personally, I feel K-Hits has a better variety. In all honesty, I think the former listeners of WLS-FM would probably be more comfortable with K-Hits' mix.
I still think CBS is hoping Cumulus will do what they are famous for and "homogenize" WLS-FM. They have succeeded with classic hits in almost every market they've done it in. Perhaps a change like WLS-FM has recently made will cause some loyal listeners to give K-Hits another chance.