David's comment makes sense to me. Forcing admins to review the background of everyone who wants rollback is a waste of time and is assigning them a responsibility for which they have no background. If you want everyone (in general) to have it, turn it on for everyone. If someone abuses it, revert and warn them like any other vandalism and then switch it off.
In the mean time, figure out why 65% was considered consensus after a short poll during the holidays.
Nathan