I imagine the DAL service is here to stay for awhile in some form or fashion. I think AA will stay there as a deterrent for other carriers thinking about entering that market.
I wouldn't be surprised (just disappointed) if they started using RJs out of DAL.
The fact that they are scaling back the Executive Service (allegedly anyway) but not getting rid of it is a positive sign. The hot towels and newspapers aren't that big of a deal anyway.
Also, the DAL-LGA flights seem to always be full. I'm flying them on the weekend of the 15th, and my flights have been virtually sold out for a month.
As for DFW, avoid it if you can. Everything is a hassle there, and DAL is quick and easy.