SA doesn't want to change, doesn't want an internal multiculturalism, wants to export their monoculture and is under little pressure to moderate as long as they have the financial means to resist change while propagating their beliefs. The fact that we want to maintain good relations with SA limits our gov't's actions to counter the Islamic push within the US. (Note that the Canadians seem to be seriously entertaining letting their Islamic community begin to apply Sharia law to their own communities.)
Our gov't wants to fight a war without putting the domestic society on a war footing. It's possible that if Iraq works out reasonably well --> change in Syria and Egypt, that eventually Iran, Pakistan and SA may be turned around, but we may not have enough time to let this happen "naturally".
The relationship that you describe between the Saudi princes and the Wahabbi Mullahs is exactly the reason that it is termed Islamo-fascism. But if you that a reduction in the US consumption of Saudi oil is in anyway going to influence the situation, with China waiting in wings to gobble up any leftovers, you are sadly mistaken.
The mistakes in the foreign policy between the western world and the Middle East were made a long time ago (as noted in the article), and it was a mistake of being too nice and underestimating the danger. We thought that because these people were uneducated, living a 6th century existence, that they posed no threat to western culture. We felt an obligation to help them, lift them up. It was a big mistatke.