The U.S. and all nations really have an interest in reducing and ultimately eliminating nuclear weapons. They are expensive armaments which drain resources from society. The more you spend on weapons the less you can apply to other objectives.
Last year ended with some momentum toward ending the standoff over Iran's nuclear program. If a comprehensive agreement can be forged this year, it will be a major step toward freeing the world of the costly and dangerous burden of nuclear weapons.
Obama's new nuclear security agenda has had to weather a brutal political environment. But one year after his historic speech in Prague, he has forged lined up his initiatives and and won congressional supporters.
Even if the Taliban, al-Qaida and other madcap terrorists succumb to the Obama charm and fold their tents, it is unlikely that the president will be so lucky as to put the nuclear genie back in the bottle.