I could definitely see them merging a hybrid of Rock 100.5 and the Bone to put at 106.7 under the Rock 106.7 brand. That would allow them to maintain that heritage "Rock" brand. Something along the lines of 98 Rock in Tampa Bay. I think there's a reason they originally reserved the URL atlantasrockstation.com. Regular Guys would fit in well with that format.
Then move All News to 100.5, as other suggested. I said from day one I didn't think they'd ever be able to compete with WSB's resources. Moving it allows them to develop the Cumulus news network in Atlanta that I believe they still want to use to feed other markets.
And then use 97.9 and 98.9 to try new stuff. Who knows what they do there.
As far as the Braves go, while their contract is with 100.5, would the Braves be opposed to a move to a bigger signal?