Personally love the idea, as Gavalin said, red dead redemption had these great good guy/bad guy scenarios and they are good. Thinking that also there could be group options in much the same fashion where it takes 2 or more people in order to complete certain scenarios, where humanity is affected just the same, but on a two fold because of course, there are two players. Necessary 'quests' suck in some games, but optional ones are great because if your not geared up who feels lie doing anything for someone else just yet, but when you are what is there to do except kill zombies and other players and try to survive. I'm thinking this may take away alot of the PvP because more people would have a purpose other than killing too, and would probably for pure randomity's sake, make the game a little more interesting. Not saying do it or else, only putting forward my opinion