I'm surprised nobody responded accurately to this:
This isn't very likely. SWA doesn't have an ATL domicile. If one is announced, it will be treated as a new domicile just like LAS, DEN, etc. Giving trannies any preference would be against the SWAPA cba.
As ATL is an east coast city, and SWA has so many pilots waiting for east coast bases, I can't imagine the SWA pilots waiving that to make trannies happy.
Bottom line: When SWA announces an ATL base, it will be filled in seniority order which means RSW pilots will get plenty of those slots.