I mean, it's a fun idea in theory, but it would have to be strictly voluntary or restricted to specific zones in the game designated for mixed PvP/PvE content. I suspect the Gambit game mode was meant to test this out, and while again, not a bad idea in theory, the implementation leaves a lot to be desired. I used to play MUDs with optional PvP in an open world mixed PvP/PvE, but you had to be in the clan system to attack other players or be attacked. Also, the game ran on a dedicated server so while there were exploits to be found, none involved attacking other players' IP addresses with DDoS attacks. :P (Although some cheaters who got banned did try to DDoS the game server itself on occasion, or at least spam the crap out of open channels with advertisements for other MUDs ;P) It's not the idea of open world mixed PvP/PvE that bothers me, but rather I worry about how it would be implemented.