There are 6 gates in the old "Legend" terminal, but they are only capable of handling older smaller DC9's or RJ's. Anything larger and then you only have 3 gates available for use due to space constraints. There are 26 gates at the main terminal. Of which WN has leases on 21, 14 are in active use. The remaining 7 were used for office and training space. They are also currently blocked on the ramp by employee parking and WN catering storage. CO has two gates in active use. AA has long term leases on 3 gates, but there are no jetbridges up, and there are some major improvements necessary before they could be used by the public.
I go back to the days when Legend was around and they flew, CO flew, AE had regionals, and AA had MD-80's...all of this with essentially the schedule that WN has right now. You are backing up the notion that there are no gates but all of these carriers operated with no problems. It seems to me that room was made then and it obviously would be for any agreement that terminates the WA. To say otherwise is speculation that is not backed up by history nor by statements of officials that would make it happen.
And Jim- most airports do not have one contiguous terminal. What they do is provide shuttles from one to the next. I don't see that as a problem in DAL. And corl is right...are you expecting BA to fly into DAL? I think that the traffic for AA would be online and local. The whole point of opening DAL is to get local traffic...not connections that won't help the Metroplex residents.