I don't see a big issue with the debt levels; the US debt is not near many other 1st world nations and so long as they are willing to cover each other's debt it is sustainable. I mean Canada's economy depends on shipping the US materials and commodities, the Chinese economy depends on American spending and imports. They have a vested interest in supporting US debt and economic activity. France, Germany, Italy, Japan all have higher debt loads relative to their size. The import/export situation isn't all that worrisome either because half of the imports is oil and that is indicative of economic growth and activity. Unlike other nations like Italy, Germany, etc the US actually imports a much lower percentage of their consumed oil. Oil is a necessary evil as it's the cheapest most efficient way to get energy. I'd be more worried if most imports were high tech, high value added products like turbines, machinery, electronics but it's not...it's about 50% oil and the rest being crappy plastic gadgets from china and clothing which are labour intensive low value add work. On the other hand the US exports equipment, technology, military, electronics; this is a perfectly sustainable situation as well.
The big concern is inflation, money supply, currency devaluation, lack of savings and financial obligations. You cannot cut taxes, increase social spending, lower interest rates and fight wars. People need to understand this.