I will say this. DAL has been looking in to DFW since it closed over three years ago. Fact is that as much as closing it may have been a mistake, it will take a lot of long term tax and fee breaks to get us to re-hub it.
There is no where on the current airport that could offer a "group" of gates that wold work. Most of Terminal E is taken up. All that is effectively left of E is Gillian's Island and that is still a long walk away from our other gates.
The reason we left was the diminished yields that the DFW market produced. It would not get any better with AA still there. This and the fact that MEM and ATL are still way too close for all of those bases.
I would love to see it, but I will not hold my breath.