If in ten years, Israel has signed a peace treaty with the Palestinians, then Obama will be considered a genius.
If by September 1939 the British and French military has been built up such that the European War that began over the German invasion of Poland ended in a quick Allied victory, Chamberlain would be fondly remembered for his Czech gambit that defeated Hitler.
By agreeing that Iran will get nuclear weapons in the foreseeable future, Obama is assuming that the next US president will see the peaceful end of the Arab-Israeli conflict, which will render Iran’s agreesive program moot.