As NASA mentioned above. Hydrogen isn't the wonder fuel that it's cracked up to be. Sure it's clean when you burn it, but it takes incredible amounts of energy to produce it. if you look at the full cycle, running a car on gasoline is CLEANER than running one on hydrogen

Also, don't think that the Saudis are the only ones getting rich off petroleum. The good ole USA makes its share, as does Canada, Norway and a bunch of other places that we'd consider alies.