WDUV went to school on the evolution of WFEZ in Miami. When EZ-93.1 launched, the music mix was similar to WDUV. But to improve the demos and go for the big revenue and audience share of WLYF-FM, they skillfully fine-tuned the music to go younger while still having a different AC appeal than Lite 101.5. When you take that approach, you'll sacrifice 12-plus/55-plus, but the 25-54 improvement will more than compensate for that.
It's a bummer for the 55-plus audience, but far more lucrative for Cox Radio.