There never was a scriptural basis for it. SV:
I remember sitting in Yankee Stadium or that staidum in Jersey City when it was first announced, and of course every, newfangled light they come up with they always quote a scripture, I'm sure a few scriptures were read when they first introduced the rotation at the assembly.
I remember my mother and a few others saying" oh, what a great arrangement, so that one brother can't get too haughty as to his being an elder for all his life" HA !! make me want to vomit just thing of that, and oh, by the way. . just what happened to that "loving arrangement"?