It seems to me the lesson is that peacekeeping missions need to be very assertive. Due to its structure the UN struggles to create assertive forces both politically and due to lack of troops and equipment. The need to prevent the spread of conflict and minimizing regional fall out will keep peacekeeping from going away whether or not the UN will be able to reclaim its role as the premier peacekeeper will depended on whether or not the structural flaws that hold back it mission are adequately addressed. If not future missions will most likely be handled by regional organization possibly to be passed off to the UN when the situation calms down.