Not to take away from any concerns like run off, siltation, etc, but it can't be forgotten that bleaching events are the reefs way of clearing the area for regeneration, much like forest fires are needed to maintain a healthy forest in the long term.
In our minute time frame of looking at things, a forest fire is often reported as a disaster, much like when Mt. St Helens erupted and leveled 1000's of square miles of forest... it'll be back and more dynamic then before the eruption.
Joe