As the budding blossoms of the Arab Spring of 2011 wither in the fall of 2013, Saudi Arabia’s fragile stability hangs from the shriveled stem of the House of Saud. The threat posed by a region in turmoil to the kingdom’s ruling elite, the strategic interests of the United States, and the health of the world economy is not so much the danger of an explosion of political unrest within the kingdom as an implosion of the country itself.