Unfortunately the late afternoon SFO-DFW flight shows no signs of returning. Now when I have business there I either have to wait until the morning after my business is complete, or take the dreaded red-eye back if I want to take American. 4:30pm might work for some, but it's just not practical for me.
Coming from other cities on the west coast, such as Seattle, the only decent option for a late afternoon departure is United, with a connection through Denver. I guess AA will make a change if they feel like they're losing business. I'm not holding my breath, though!!
I have noticed a few flights here-and-there starting to come back, though none as important to me as the late afternoon west coast departures destined for DFW.