No country wants to use them. But all wish to have them. Ultimately what will happen to all these weapons. say after 100 years?

I don't know. What do you think will happen?

The possibilities are three-

More will get made
all weapons will be destroyed by the makers
Somebody will accidently fire one and begin a war and we will have total destruction of the world.

I hope all nations around the world abolish these weapons.

Amen.

that would be ideal but it is highly unlikely. This is because the countries that have them are very reluctant to give them up and understandably so. having nuclear weapons makes a country a superpower, and that kind of power is very hard to give up.

When we speak about a 100 years, many things may change.

yes, but we are talking about the most powerful weapons on earth and we know how hungry humans are for power. Only a fool would give up that kind of power.
Nuclear weapons are also for defense because they act as a deterrent against nuclear attacks. A country that has nuclear power is untouchable because, well it has nuclear power. I really just don't see a country with nuclear weapons ever giving them up.

Let us hope for the best.

Yes, let us hope that a nuclear war will never happen for the survival of the human race and other living things.