It's all in your mind buddy, it's not "different this time". You've been listening to the goldbug propaganda forever forecasting Armageddon.
The last time debt/gdp was higher, it was much higher and it reduced very quickly when everyone got back to work.
The USA paid back the War Bonds and manufacturing and sales ramped up. This time it's the recession, the USA will more than likely reduce its debt, but others argue it doesn't have enough.
Oddly it's only the goldbugs that get worked up about it, why's that do you think? The Chinese government has approximately US$4 trillion in US treasuries but only US$45 billion in gold, so it obviously trusts the USD much more than it does the '5,000 year store of value'.