The US dollar is not a major economic indicator of the future growth of the US economy as there is little correlation between movements in the dollar and economic growth. There are both positive and negative aspects of changes in the value of the dollar. A falling dollar benefits American businesses exporting overseas since it makes American goods cheaper as well making American products cheaper in the US compared to foreign goods. However, on the negative side, the higher price of foreign goods is inflationary.
This is true. But since we've eviscerated our domestic manufacturing, this helps us how really? Secondly, the devalued dollar that means our oil is more expensive. That makes all American products that rely on oil (which is all of them) more expensive. Whoopsidaisy.
In 2008 and 2009 during the recession we saw run ups in the dollar as foreign businesses saw the US dollar as a safe haven. During the recession, the inflation rate in the US was near zero. As we come out of the recession, inflation will increase as it always does. In 2010, the dollar began a sharp fall in response to expected inflation.
Ah... the Pre Greece and Iceland meltdowns. Yes. Comparatively the dollar WAS a great safe haven. Right now? Australia is one of the best currently, but well... the whole world sucks. The question is who sucks worst.
And that expected inflation may go over 20% a year. If some of the numbers I heard come true, we could be looking at 20 dollars for a loaf of bread inside of 2 years. I think that's probably exaggerated, but... remember the 70's. Supermarkets were significantly raising prices 3 times a week.
As far as China is concerned, they are selling dollars because they have no real choice. Being their biggest customer, they are accumulating a huge number of US dollars with the growth in US retail sales. In the past they held those dollars in order to keep the value of the dollar up and cost of Chinese goods in the US low, but that’s changing. The US has been pressuring the Chinese to stop playing games in the currency market and apparently that is what they are doing.
And they're scared to death at the policies of this administration. They've artificially pegged the Yuan under the dollar to keep a trade advantage. Now demand has tanked, they have a devaluing dollar and there are very few markets that can keep up with what the US was which endangers their needed growth to keep the masses happy. The admin is playing a very very dangerous game of brinkmanship with the Chinese and the chances to win are slim, or at least result in a Pyrrhic victory at best.
If a 20% decline of the US dollar against major foreign currencies signaled the collapse of the government and our economy this country would have never seen the 21-century.

I did not say that it would, I do believe it is possible, with the forces aligned to 'improve' this nation into a socialist paradise with the New Deal part 2.