CBS owns the Atlanta station.
It appears that the only possible format changes or tweaks to full power FMs locally would lie strictly in the hands of Cumulus. Probably a flip for 106.1. Who knows what 100.7's future holds? 102.7 could get killed by the Cat if they aren't careful, but that would probably take a couple more years.
I have a feeling that CC will work with CHR on 107.3 for a while longer, but without some change in it's signal it will wind up with a spoken word format before any other local CC FM. The other CC FMs are all very stable.
Also, look to the Apex group of 92.1, 98.1, 102.1, 103.1 down in FWB. Country will live on 98.1 forever, but the ownership may change due to it being a very valuable signal. I wouldn't be surprised to see a change on one of those stations tomorrow.
The fate of the short term future of our radio dial lays in the hands of AM stations and FM translators.