Uncle Sam is running out of people to borrow from, and is having trouble paying interest on his loans.

Blatantly false. Interest rates are at an all time low, lower than they were in the 90s when we ran a surplus. The government can easily finance its debts. As you mentioned we have low inflation, and higher inflation would actually help. There is some truth that having an overvalued currency makes imports cheaper, but there are plenty of other motivations for companies to outsource. The video is actually pretty two-faced in this regard; it laments the falling value of the dollar while it regrets that other countries have cheaper currencies. There is probably more wrong with this video, but I only made it three minutes in.

The long run debt problem really boils down to three things: medicare/medicaid, Bush tax cuts, and military spending. If we just had the same per-person healthcare costs as other modern countries alone, deficits would be almost negligible. Plenty of libertarian types will decry socialized medicine, but it has the best track record. There are other ways to reduce healthcare costs, such as letting the government bargain with pharmaceutical companies for drug prices(this is something I think the US is alone in not doing). Other than that, the military and tax angles are self explanatory.