It depends largely on what the reaction to reinfection is. If the 80% that did not require hospitalization for round 1 stay out of the hospital for round 2 ... n, then the thing will eventually fade in the background and become just another variant of the common cold.
If nothing else, it may actually take care of the aging population problem in certain countries.
If nothing else, it may actually take care of the aging population problem in certain countries.