Which Comes First - the Discipline or the Egg?

As part of our polity class Dr. Kind had us draw up pretend memorials to send to General Conference to revise the Discipline. Mine, I decided, was a membership requirement describing a member's responsibility to be a responsible steward of natural resources.

My question is this: Do we change Discipline to match social reality or do we change it to match our goals as community? In the last post many have commented on gluttony and other social evils our church should be taking a stand on (sometimes distracted by arguments about drinking, etc). Should we have a grassroots movement of activism to get the church focussed and then change the Discipline to match the new movement, or do we change the Discipline because 2/3 of the GC and of the districts believe this is a wise thing?