I see merit in keeping principals in schools where they are successful as long as they continue to be successful. Changing principals around just to keep them from getting stale is not a valid argument. Our schools are in so much change now with the new state requirements that changing the leadership would increase the stress level too much. But when a person retires the effect is almost the same. If you really like your present principl's leadearship then fight to keep it.
School boards do listen to their patrons.