If their biggest customer, the US, buys less oil, the Sheiks will have to lower the barrel price.
You never give up do you?
The Sheiks don't set the price, the markets do. US consumption was down 4% in Jan 2008 compared to Jan 2007 but Global consumption is still going up. India and China are becoming very big players, and still only 1% of the Chinese population has a private car.