For now it seems to me like a way for them to have something technical that allows some association without changing anything meaningful in their policies. Most JWs will never see a Flock book.
Many devout JW's already "go beyond" what has been written regarding shunning. Many already shun "inactive" members who have had NO judicial determinations (faders). They simply no longer show up for meetings or field circus. Still, the super-righteous JW's are shunning them.