I suspect that AA will implement blanket waiver policies -- if the need arises -- as it did for China rather than dealing with this on a one-off basis. Further, I expect that at least the US carriers will move in unison or at least within a few hours of each other, if they move at all.
I would just keep watching the situation as it might change tomorrow, the day after, or not at all.
Bottom line, if there is no waiver, would you really travel if you felt unsafe doing so?