They had a committee look at the F/S rule, as it applied to the SA/WA clubs as a result of the Bryce Gibbs debacle. From memory, the committee recommended adding 5 years to the eligibility window, noting that it took 5 years before our first player reached 100 AFL games with the AFC (and thus became eligible under the AFL's F/S rules). This would have resulted in Bryce Gibbs becoming eligible for selection by Adelaide. The AFL rejected the recommendation, at the insistence of the Victorian clubs, introducing the "Grandfather Rule" instead.
Under the "Grandfather Rule" players need to have played 200 SANFL games, for one club (no good if they played 130 for club X and 70 for club Y) and they had to have reached this milestone by 1990 (Adelaide joined the AFL in 1991). Originally they had to have played these 200 games between 1971-1990, the 1971 cut-off was removed. They also removed the 20-year sunset clause, so Adelaide are still able to draft the sons of SANFL players, where originally they were not allowed to do so after 2010.