The article provides a history of OPEC but does not really address how the last several years of developments in US oil & gas production (and natural gas demand) affects OPEC’s market power.
2Q 2014, OPEC produced 39% of the World’s Oil.
2Q 2009, OPEC produced 40% of the World’s Oil.
Their marketshare really hasn’t changed much. Our increases have been offset more by other losses and increases in total global demand.