National Debt to reach $99 trillion by 2048

http://theeconomiccollapseblog.com/archives/destroying-america-it-is-being-projected-that-the-u-s-national-debt-will-hit-99-trillion-dollars-by-2048

With annual budget deficits of $6 trillion.

The author of the above article states: " Of course we will never actually see the day when our national debt reaches 99 trillion dollars.  Our government (and our entire society along with it) will collapse long before we ever get to that point.  In our endless greed, we are literally destroying America, and emergency action must be taken immediately if we are to survive."

I want to know when it will reach $1 quadrillion dollars.  And why does it have to end?  That is why I started using scientific notation to represent the debt.  Computers can represent extremely large numbers in floating point.  It is a long way until you reach infinity.