I think the best route would be to remove one campaign. This way people who like small scale combat would get it because that is where the people who lost that campaign would go. The only downside to this route would be that a faction will be upset. Otherwise I'm fine with how things, want PVP? go thorn, want to PVE, get skyshards, lorebooks, and a tinge of danger of other players while doing so? go to a buff campaign.