Is The US Government a Giant Ponzi Scheme?

Continuing with my pre review of David Stockman's book, here is an interview with Stockman. 

How long can the current situation continue? I do not know, but my guess is 5 to 7 years. It could be longer, or it might be next Tuesday. There are some hopeful signs, so I am not quite as pessimistic as Stockman, but as Herb Stein said in the 70's, "If something can't continue, it won't." 

The Great Unknown is the answer to this question. "What will happen when investors quit buying US Bonds?" 

To use precise, technical language, we are headed toward a giant oops.