All laws dealing with the eligibility of probate judges to assume duties and obligations, and to claim and receive benefits, as supernumerary probate judges are, as to all persons who were eligible to assume such duties and obligations and claim and receive such benefits as of October 1, 1976, continued in full force and effect, and shall not be repealed by the adoption of this code. But at such time as all persons who became vested with eligibility, either present or prospective, to assume duties and responsibilities, and to claim and receive benefits as, or, in the case of surviving spouses, on account of, supernumerary probate judges as of October 1, 1976, are deceased, all such laws shall thereupon be repealed.