simply no, the pk server will have no sense, look at the gatherer that will simply victim to be prey on...
this game was not means to be pvp from the start and is better like this, bring pk server will only serve to bring more toxicity than needed. you want to pvp, you have the frontline, the feast and the wolve's den.

pk will recquire a combat system less slow than what we have right now and especially not with jobs that can be crafting and gathering without defense!