Corporations incorporated or qualified to do business in the Northern Mariana Islands on the effective date of the Constitution shall continue to be incorporated or qualified until provided otherwise by law. Licenses in effect in the Northern Mariana Islands on the effective date of the Constitution shall continue in effect until provided otherwise by law except that no license possessed by a land surveyor, ship officer, health professional or a practicing trial assistant may be amended or revoked except for incompetence or unethical conduct.