Didn't read the full thread so someone may have already said this.
I don't see world PvP working at all in this game for the main reason that PvP has its own abilities. If you're just out in the world and get into a fight with another player. How would that work? Your skills switch just for the fight? What about if you're already fighting a monster. Do you then keep PvE abilities or what happens?
In a game where PvP and PvE have different skills, you can't mix the two or you end up with a really dumb system.