Only a more representative United Nations Security Council is legitimate.  The United Nations is a global body that must represent the whole world. Just as democratic governments need to remain representative to be legitimate so the same is true of intergovernmental organisations. If the UK and France hang on to their permanent seats forever, the UNSC will lose its legitimacy, as the United Nations will no longer be seen to be representative. The result will be an increased risk of war and conflict because the world’s major powers have no legitimate shared arena for discussing their interests. This is exactly what happened to the League of Nations after World War I. As many of the most powerful nations, USA, USSR and Germany were unwilling to join or barred from joining the League never had much legitimacy. As a result the League was unable to prevent conflicts in Manchuria and Abyssinia (Ethiopia) eventually leading to World War II. [1] Since their interest in a stable world through the legitimacy of the UNSC outweighs their interest in a formal veto-power, France and the UK should be willing to give up their veto power.  [1] Kissinger, Diplomacy