Francis Fukuyama makes a good argument that we should. Not only do we not need those bases, but it would be good politics: "But the most powerful reasons are political. U.S. forces are today welcomed in Baghdad as liberators. But there is great suspicion throughout the Arab world--unfounded--that we secretly plan to occupy the country. Announcing a withdrawal from Saudi Arabia will underline the point that our military deployments in the Gulf are not ends in themselves, but serve specific and limited political objectives."