Sections 8-4.1-1 — 8-4.1-3 shall not take effect for any existing court clerks or administrators presently receiving an incentive pay under this chapter until the expiration of any collective bargaining agreement in existence on July 5, 1994. However, upon the expiration of the collective bargaining agreement which is in effect at the time of July 5, 1994, § 8-4.1-1 — § 8-4.1-3 shall apply to all existing clerks receiving an incentive under this chapter.