I am sure IF Southwest goes to assigned seating they will do it sort of like the "big" guys. By that I mean they will probably not allow all seats to be chosen in advance. Also I would think they would allow those such as yourself, companion pass holders, to select their seat whenever they booked. As it is right now carriers block sections of seats for thier FF. Just take a look on any airline web site. If you were to book say 6, 7, 8 months out you would probably find that not all seats are available.
Also with Southwest's new process there will be 60 A's and 60 B's. My feeling is they should go to assigned seating. I don't think there is anyway they will be able stop those nasty line cutters. With assigned at least they can try and keep some of the seats blocked for FF.
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