Back during Mists of Pandaria on WoW, my guild transferred to a PVP server. It was the most miserable experience I ever had in the game (and for comparison, I was there for the launch of Warlords of Draenor). Griefers everywhere, people camping corpses and respawn points just to be jerks, high level players hunting lowbies for basically no reason. It sucked.
So no, I would not be interested in open world PvP. Maybe if they made it a dedicated server so I could just never, ever go there, but....no. Not for me.