Here are the SOS duties. As far as I can see it's a much ado about nothing position.
Serves as the President's principal adviser on U.S. foreign policy;
Conducts negotiations relating to U.S. foreign affairs;
Grants and issues passports to American citizens and exequaturs to foreign consuls in
the United States;
Advises the President on the appointment of U.S. ambassadors, ministers, consuls, and
other diplomatic representatives;
Advises the President regarding the acceptance, recall, and dismissal of the representatives
of foreign governments;
Personally participates in or directs U.S. representatives to international conferences,
organizations, and agencies;
Negotiates, interprets, and terminates treaties and agreements;
Ensures the protection of the U.S. Government to American citizens, property, and interests
in foreign countries;
Supervises the administration of U.S. immigration laws abroad;
Provides information to American citizens regarding the political, economic, social, cultural,
and humanitarian conditions in foreign countries;
Informs the Congress and American citizens on the conduct of U.S. foreign relations;
Promotes beneficial economic intercourse between the United States and other countries;
Administers the Department of State;
Supervises the Foreign Service of the United States.
It's mainly an advisory position with no power. If Clinton and Kerry can do the job
anyone can.