To me it's possible to create a scenario and plays it in a full PVP MMO, as long as the players involve in such roleplay activity considere that loosing is also a possible outcome of a scenarised event. If we accept to loose because of the involvment of unwanted party within our scenario, then the RP experience will offer a great benefit to everyone. And the ''RP Hunters'' will loose their ability to disturb other players experience.
Roleplaying often means creativity, then a defeat in PvP, may result in interesting outcomes to plays.
You're right, but this obsevation also apply to democratic process, where people elect a small groupe of people to lead them. However time will tell what will happens in DU. We'll we have stratified and centralised organisation, or more decentralized and consultative organisation? I think this will be an interesting observation to make.