I'll make a bold prediction, the 737MAX will never return to service anywhere near its current form, not just for AA but for all the rest of the carriers. MAX is like a car that has an engine so powerful that if the gas pedal is pressed all the way it will fly off the ramp, sounds crazy right!!
BTW, this will require a bailout for Boeing, likely through some defense spending boost on useless stuff the Armed Forces don't need.