The worsts scenarios
1.)The worst scenario that we could have is that there is a possible conflict like a cold war situation in which powerful countries start to create new and deadlier nuclear weapons to threaten each other. At the end the worst case would be that they start to have courses of action in which just words turn to be actions...like launching a nuclear warhead against this other country. At the end this countries like USA, Russia, North Korea, etc will start launching their missiles and they will start to destroy each other with this weapons. There are very few possibilities that people inside this countries survive because the nuclear warheads that they are going to send are going to be few but with a high probability that it affects at least three times more than the Tsar Bomb.
2.) Another possible scenario is that we are going to be still being like this living like normal people but with conflicts that may put in danger our world from nuclear weapons. However other countries may be attracted by the destructive power of this weapons and they will finally be producing them. This may just be for power so this is another possibilitie of what is going to happen if the nuclear weapons are not banned and destroyed. Moreover in the worst of the situations there could rise in small country with nuclear weapons a ruler that wants to control all the world (Just like Hitler) and he`s going to use this nuclear power to do it. Countries like USA and others will be afraid of him because, if they do something to defend a small country that is being attacked by this ruler he may use his nuclear weapons in order to threat this countries that represent a danger for him; This could go even worse, he may just launch his destructive nuclear power without thinking it twice when someone threatens him.
The possitive scenario
In the best of the situations people may take concience about this and will ban, destroy and although get rid of this machines of death. Finally they could use some parts of this nuclear weapons to create energy or convert it into another thing. for example the core of the nuclear wrhead could be used to generate energy, just like a nuclear plant and the other parts, if not being irradiated by the radiation, could go and turn into different things for fabrics or almost anything.
The scenario that is more likely to happen
The scenario that is more likely to happen is a mix between the worst scenario and the possitive scenario that I had shown before. Like in every country people will just not care about this because they think it is not going to affect them ever but anyways, some people will care about this issue and will start to protest. The head`s of the countries that own this kind of weapons may have some conflicts and may keep threatening between them when an issue is between them but at the end they will not do nothing because it is too risky to use this weapons to kill a massive amount of people. This people cannot live with this so that`s why they don`t do it yet and although that`s why the dictator kim and although Barack Obama probably didn`t do anything about this little conflict that they had for a short time ago. In despite of all this there is always a small possiblity that some of this countries that own this weapons may launch them, so there is still a small probability of getting killed by a nuclear warhead. That`s why it should be banned.