I highly doubt that Entercom would go talk with any station. WIOD and WLRN, the 2 English talk stations in the market, don't do very well. Miami-Fort Lauderdale is just not a "talk" market.
Probably not, however as a non-commercial station does WLRN need to rely on ratings in order to set rates for underwriting announcements? They certainly need a base audience in order to secure individual listener donations but does Neilsen influence how much money say, the Knight Foundation donates to the station annually?
Without the benefit of knowing how WIOD does in its target demo(s) I can only wonder what will happen to both it and other stations once Rush, Beck and Hannity decide to hang it up.