It will be interesting to see the results of this if we even get to see them. It's not an accident in the official sense and I don't know how much of the investigation would be made public. Certainly civil lawsuits are likely and SWA has to be prepared to defend those.
Actually, this is not a candidate litigation. Such cases depend on being able to prove damages. There were no injuries or property damage reported. The flight was 5 hours late prior to touchdown so any inconvenience claims were largely caused by something other than the airport selection error.