AA will not fall, it might undergoe huge changes, but if AA fell, travel as we know it falls. It is rediculous to think that one of the largest if not THE largest transportation companies in the world will fall within a year or two.
On another note, who the hell knows what AA will do in the future, anything can happen. Hell, for all we know AA will replace the S80 fleet with 200 A380s, or maybe they will be replaced by 500 B717's, or maybe they will be replaced by 300 sonic crusiers. The point is anything is possible, who knows what is going to happen, my eight ball and crystal ball are out of commission so i will not be much help.
As for where the S80's will go afterward, prolly to that big axe in the desert.