I don’t think AA would drop their DFW-NRT flight. Although that being their only NRT route is also not good news, unless they are launching a flight from another hub.
I'm honestly not sure what is going to be with NRT. I'm list 1 of the NRT flights cancelled (and moved to HND.) Whether AA keeps LAX (I'm assuming no) or adds another destination (my LAS suggestion) is the interesting part.
Moving the NRT flights from DFW & LAX to HND would leave AA with 10x weekly frequencies under current schedule at NRT. If they drop ORD down to 1 daily NRT from DFW. They could keep that, drop that, keep LAX/DFW, or add a city or drop NRT. Lots of options there with that only moves a couple of frames around.