I hate PvP myself, but support this idea with some provisos:
1. Make rewards similar to current PvP rewards (I don't mean in terms of looks, I mean types, Glamours, Mounts, Minions, etc, but with all new designs. Nothing PvE though)
2. Don't gate main scenario or Mentor roulette duties with it (perhaps some PvP-PvE hybrid duties could be added though?)
3. Add a warning when you try to enter the zone (this way someone doesn't accidentally stumble on in and get creamed, you KNOW what you're getting into). If you say no ya don't wanna enter, your character turns around and leaves.

Why do I support it? Variety is always good, even if it's something I won't enjoy.