I disagree. Only 1 or so trillion dollars is owed to China, and since the United States is the holder of the world reserve currency and controls the international shipping lanes, I don't think it will fall.
However, lets look at china. China is building the equivalent of two New York Cities a year. This costs a lot of money and this is only happening on the coast. The rural areas are still poor, underdevelopped, and unemployed. China is pulling a major 1980's Japan. It will fall
Like it or not. The next 100 years are the American age.
Libya will adopt a pro-U.S./pro-NATO regime. They will be a puppet. As what is happening to Iraq and Afghanistan. American corporations are moving in and taking control.