A lot of opposition to open-world PvP on these forums... I don't want to hear talk of "why not just let us duel instead" or other such alternative suggestions... I want discussion to focus on this One Idea:
PVP FATE's.
They pop sporadically & are time-limited so you don't have to worry about the "Duel me, Brah" harassers.
You opt-in to them by Syncing to the FATE (activates your PVP Abilities/Morale).
Different types, some scaling with participant count.
Deathmatch (respawn in a Safe-Zone).
Item Submission (one per kill, many littered around for pick-up, all lost on death, turn-in at Safe-Zone).
Objective Contest (like FL Center, so much potential here).
Zone Control (like FL Flags, # scales with participant count).
...
Sure, some Jobs will be more effective but that's less of a matter here... this isn't meant to be taken as seriously as instanced or ladder PVP.
Rewards: Gil, PVP Experience, PVP Potions, & Wolf Marks.
Bronze/Silver/Gold/1st/2nd/3rd Bonus Scaling Rewards.
Upon Spawning, there'd be a reasonable waiting period before the Event starts so campers can't effectively get an early lead or kill-trade.
Would need to all be FFA to prevent abuse & promote fairness... some people would argue this isn't a necessity, but if you want Group-Based PVP you can play Premade Frontlines.
I also agree with the poster who suggested SE let us challenge our friends in the Wolves Den as a solution to dueling.
...
BONUS: could be neat if some had "stage hazards" like Electric Walls or Spike Traps, so many possibilities. Fluid Aura into Electric Wall, Holmgang into held on Spike Trap, etc. Fun stuff.