Upstate, I didn't know anything about Cox's intentions for both radio and TV so your post is appreciated!
To answer your question, I'd think there could be buyers. I'm not sure if an Entercom would be interested in the Jax market but perhaps smaller companies would be. But who really knows. Flagler Broadcasting has proven to be an aggressive company. They superserve Flagler and St. John's counties and they have recently added Country 106.3 in St. Augustine. They've got news/talk, two adult hits, a really 'cool' classic hits station and now 2 country stations. That's quite an achievement for a so called small company. If there is any station I think they might consider would be 106.5 WXXJ. Given its coverage of the southern half of Duval, it could prove a logical expansion move. If memory serves me correct, their GM, David Ayres had a role in that station many years and formats ago. Jax radio needs quality broadcasters for sure. My two-cents there.
With Planet moving to full-market signal at 107.3, I have to wonder if this had anything to do with Cox Media wanting to divest itself of radio. My first reaction to Planet 107.3 was iHeart finally grew a pair. But, Just maybe they figure Cox wouldn't challenge or flip any of their stations but just hold the course to remain as profitable as possible to attract new owner(s). For the record, I never understood how iHeart gave up on the extraordinary Planet brand. Despite all the listeners who wanted Planet back and then ultimately for it to find a better signal, it may very well be Cox's 'situation' that finally got them to make the move.