Yes I do think that we will reach a point where war is obsolete, but it will only occur after we kill all humans

Even if we stop shooting each other, conflict between human groups will not stop so long as human beings exist. This is not to say that war or conflict is inappropriate, though it largely is, it is to say it is the nature of an animal which we are. The genocide in Rwanda required conflict to fight, and the lack of immediate conflict allowed for the continual slaughter of innocent people. So long as there are bad people, or different perspectives, war is going to occur, and likely be necessary.