Originally Posted by TopBucks Lilit

USD is supported by China. No way China would let USD fail and harm its economy by losing their main trade partner.

Just look at the numbers:
http://www.uschina.org/statistics/tradetable.html

Not to mention that China is the main investor in US economy.

Thus in my opinion it's too early to speak about US(D) collapse because everyone realizes that it will be collapse of the entire world's financial system.