Are the Gulf states really going to let the US cripple their economies without suitable measures (hard cash, investment, resources and favours) being put in place before hand? I don't think so. The recent softening by Obama is probably due to the realisation of how much this war would cost. Israel starting the conflict seemingly against US wishes would be a bit of a boon for the US administration. Keep Israel in their rightful place as the bad guys whilst also blowing up the worrying nuclear sites and making any action against the Straights by the Iranians unjustifiable.