Absolutely not. Besides the fact that this is AA's headquarters, DFW is a critical mid-continent hub that can connect passengers anywhere in the US in <4 hours. Dallas is a booming city and one of increasing importance as a center of job and population growth, economic activity, etc., and a place where AA has a lot of economic and political sway. Why would they move away? There's just too much to lose and no other location that AA could objectively expand to the degree that would be needed to replace DFW.

Now, I'd like to see them come up with a more cohesive strategy for their international gateways and would expect to see more TATL growth in PHL and CLT as opposed to DFW, and hopefully a desire to rebuild LAX as their TPAC hub down the line.

Still DFW is AA, and AA is DFW and that will not change in our lifetimes.