It will be doubly hard for the GOP to wean itself off the neocons because anybody who points out the mere fact of neocon money and media influence is denounced as an anti-Semite. And most people in public life would rather let America blunder into more Middle Eastern wars than be denounced as anti-Semites.
Of course, neocon/neolib loyalty to the GOP is a lot less of a sure thing—they are maneuvering to try to dominate the foreign policy of the next Democratic administration.