I was hoping a new etiquette would emerge. Watching a documentary on Confucius the importance of his ideas only really came home to me when I looked at social media. Politeness holds society together and was invented and enforced not evolved.
The real challenge being getting people to grab hold of the new rules and self police. How do you do that bit?
I once heard a Radiolab (i think it was Radiolab) which discussed the treatment of German soldiers vs American Japanese in internment camps in American during the war. In that respect the Geneva convention — being a set of rules- made a lot of difference for the Germans. Maybe writing the rules down is enough.