We have a deal (or do we)

It looks like there is finally a deal on the North Korea nuke.
But we would not need a deal if North Korea did not cheat on the Agreed Framework that they had signed. I wonder what's different this time. I wonder if there is anything in the deal to prevent North Korea from starting their nuclear program the next time they don't want to play nice.

I more I think about the whole thing, the more I feel that nuclear nonproliferation will never work. Why are some countries allowed to have nuclear weapons but not the rest of the world? The US may say that Iran and North Korea are rogue states. But how do you define rogue objectively? I think the only solution is to get rid of all nuclear weapons for everybody. And I do mean everyone. I wonder if we will ever get there. Sure, it will happen when mankind invents something even more destructive and makes nuclear weapons obselete.