If you read financial news, you will discover the phrase "Too Big To Fail". What does it mean? Basically, it means if some giant financial institution or country monetary fails, it will create catastrophic for the whole nation or the world.
In Forex Market, political and economic events force the price movement heavily. For the last 6 months, Greece dominated the FX market news. Everyone know Greece has a lousy and unmanageable debt which drag EURO down to bottom and no people wonder why USA have more then USD 12 trillions debt but still consider the most powerful economic nation of the world. Visit this link and you will be shock!! http://www.usdebtclock.org/index.html
Why? The answer is USA is really too big to fail! The whole economic debt and financial web are spiraled by USD. China and other large nations are holding USD dominated papers. If USD value go down, so will these nations assets. Most of the developing countries still rely on the export to USA
Do you still think USD value will go down to drain? In the next 30-50 years, it is impossible!!! By the way, I am not supporting USD but only telling you the facts.