This is classic example of one of those posts that try to analyze things in a stupid way. Kinda like doctor explaining why cancer can be beneficial because it increases white blood cell production, with few fancy words thrown in.
The deficit does not merely reflect increase in savings in the private sector, and if it did it I would argue that it would not be a good thing that they were used to finance consumption (which is what the govt mostly does). The problem is that the deficit is made possible not merely with private sector's savings but with printed money and savings of the chinese people. In other words the trade deficit and inflation(which means decrease in savings of the private sector).
Trade deficit is not good or bad. It just means you are using resources that you don't have and must pay them back later. However, if trade deficit is used to finance consumption you are going to get bleaker times in the future. And that is where you are at. US with the lead of the government and FED is spending all the money, and then the trade deficit that results is invested back into the USA to... finance even more government spending.
And then the government promises even more benefits, which means people think they are wealther and, will most likely run to the mall to buy some more chinese products. To finance this the FED has to step in and lower interest rates, and people will abandon even more savings and instead burrow money to finance some more consumption.
This won't continue forever to be sure. At some point the world will wake up. Maybe the lesson that everybody already knows will be remembered again. You can't spend and burrow yourself into prosperity.
The US isn't dependent on China, Japan, OPEC countries or anyone else to 'finance consumption'. All government spending is by its very nature 'money printing' because there's an increase in reserve balances. In point of fact, the government creates money ex nihilo under a fiat system. The value of your dollar in your pocket is the product of seigniorage, production, taxes, regulation and laws.
Oh yeah, so what would happen if the US ceases to be the world's currency? Nothing. It's a non-issue. The only way for the rest of the world to get rid of dollar holdings is to exchange said dollars for real goods and services produced by Americans. For example, every foreigner that possesses said dollars, would have to hand their dollars back over to Americans who worked to produce the real goods and services which they would have to purchase. The is only feasible way for the rest of the world to reach zero dollar holdings. So if an Irishman exchanged his dollars with a South Korean, that wouldn't work, because the world would still posses said dollars, and they would simply be changing hands. The 3 trillion or so held by foreigners would be the hugest shopping spree in the history of the world. Our 500 billion dollar trade deficit would would vanish and we'd have a 3 trillion dollar trade surplus.
On the other side the coin, China, Japan and the OPEC countries, which have historically run huge surpluses with the US, would simply have deficits of a similar proportion, that's about it, plain and simple. Americans would get dollars and foreigners would get the real goods and services produced by Americans, such as technology, software, cloths, medicine, automobiles, motorcycles, planes, a very large chunk of the US produces. The problem is, retards like Peter Schiff, Jim Rogers and the doomsday crowd hasn't thought this one through.