Well, we guessed this already.
"Up to 30 new countries could have the capability to build a nuclear weapon, on top of the nine current nuclear powers, the head of the International Atomic Energy Agency has warned. We need to develop a new system of international approach (or we will not) end up with nine (nuclear-)weapon states only, but with another 20 or 30 states which have the capacity to develop nuclear weapons in a short time," IAEA Director General Mohamed ElBaradei said in Vienna.
If widespread nuclear proliferation is inevitable there ought to be a system, such as that suggested at Winds of Change of registering the fissile signatures of each country in a secure database to prevent their transfer to terrorists by assigning the responsibility of any attack using those materials to the originating country. Furthermore, if many small countries have the bomb, there is no sense in Japan, the European countries, Canada or Australia forswearing possession. In related news, John Negroponte has confirmed that the recent North Korean test did indeed involve a trial of a nuclear weapon. (Nothing follows)