This would really kill the persistent, open world feel to the game. Maybe have some areas that will always have a degree of safety but much lesser resources, so tribes who move out to defend their lands get the bonuses that come with it. Splitting the game into PvP and non PvP servers kind of kills the whole idea of Xsyon, a world where you have to learn how to survive along with others, a true open world.
It would suck if half of this game became naked people ganking each other, and the other was a glorified multiplayer minecraft.