We are based at Dallas Executive (KRBD), a contract CT on the list. It lies below the DFW shelf in one of the busiest airspaces in the world. It is designated as a class B reliever airport. As a class D, it is comforting to know that when I get a handoff from the D10 TRACON to the RBD CT on arrival, that they continue to keep me on radar and while separation in the class D airspace is not a responsibility of the CT, they do keep me aware of the traffic, most of which is just trying to stay clear of the DFW bravo just overhead while in transit. So losing this tower has me a little concerned about my own transit vertically through this space, both when departing and arriving, but especially on arrival in MVFR when the chances of close encounters with scud runners is high when I break out on approach. It also makes departure a nuisance because I need to contact TRACON from the ground to obtain my clearance, easy enough to do but they don't like the call unless you are holding short and ready to takeoff, and that is followed by a five to ten minute wait for release. This is something I do when the tower is not open, usually early in the morning when traffic is "light". If I have to do that in the day when there are hub complexes running at DFW & DAL, I honestly don't what kind of release delays to expect (hoping someone else on the board who routinely operates IFR from under the DFW bravo from an untowered airport might chime in here to give us a hint as to what we might expect).
So I guess my main concern from a safety perspective is the change from class D to class E in this extremely high volume airspace. I have flown into many of the other towered airports on the list here in Texas and I don't have the same concerns.
There is one that is not on the list because it doesn't have a tower, but it should have, and that is Austin Executive (KEDC). While the airport is not under a class B shelf, the approach to KEDC from the north and northwest crosses the flow to Austin Bergstrom and it gets very hairy when there is a southbound flow into KAUS so it's a similar situation to the one at KRBD and that is my point of reference for what to expect at Redbird. Not fun.