There might come a point where the -until now- reluctant, clean, rich, NPT-compliant countries don't accept to see the rogue guys arming up around them anymore. One day the Japans, Swedens, (S) Koreas, Brazils, Australias and Germanys might rethink staying sober. Every idiot terrorist will be nuked up sooner or later. Nothing is prevented by NPT just slightly delayed if ever. Just one terrorist dirty bomb attack or similar and their public opinion and mindset might change forever.