(1) When a home rule city having a city board of education changes its charter to repeal prospectively its charter provisions authorizing it to maintain a separate school system from the county in which it is located, no further election for the city's board of education shall be held within the period of three (3) years before the date of the merger of the city school system into the county school system. The members in office at the time of the charter vote shall remain in office until the repeal takes effect, unless the intervening period is more than three (3) years.
(2) The powers conferred by this section are in addition and supplemental to the powers conferred by any other law, charter, or home rule provision.