I don't know one thing about SWA's scope clause but if I were king for a day and didn't have to worry about that SWA pesky pilot contract:
Buy ATA airlines and operate it as a separate subsidiary and expand in International markets. ATA operates different aircraft and different rules for international ops. SWA's business model could continue on with it's winning formula while reaping the benefits from the extra feed ATA brings to the table.
There is no reason to do this right away because SWA is getting all of this through the code share agreement. I know you will all throw your B.S. cards at me but I'm just voicing an idea that is possible maybe not probable.
In either case SWAPA and ATA ALPA should be in talks making sure that our respective Companies don't use one group against another, been there done that. SWA pilots may say, "who cares about that tiny little ATA pilot list, we could just swat them like flies".
That could be exactly the response SWA management would like to hear.