Nope. Lesson #2 (Stein's Law): What can't go on forever, won't.
This is why the perennial battles over the federal budget are important. The total amount of US Gov't. debt (the so-called $16 trillion figure) is currently sustainable only because interest rates are so low and have remained so for several years. Servicing this debt (that is, paying interest to holders of U.S. bonds) for FY 2012 cost about $360 billion and is expected to grow to $415 billion in FY 2013. As a line item in the budget, debt service is #4, behind what is spent at HHS, DOD, and the SSA. If interest rates start to rise, or if the annual deficit is not reduced, then a lot of discretionary funds will have to be channeled into paying interest rates on this debt to avoid defaulting on outstanding bonds and to be able to sell new bonds.
Right now, the Chinese, who own a very large amount of US bonds, are content to park their money in these financial instruments. But the Chinese also want to modernize their country and become more involved in international trade. To do this means that they need the money they have stockpiled as a result of their export trade, and it means there will be less money available to purchase US debt. If the Chinese stop buying US bonds, then the Treasury will be forced to offer bonds with higher yields to attract other investors, and higher yields mean that the debt service costs increase.
http://www.treasurydirect.gov/govt/reports/ir/ir_expense.htm