I genuinely hope a whole bunch of countries get together and stop using the USD altogether. Make the Euro the standard for Gold and Oil, etc, stop trading on the US-based stock markets, etc. etc.
America's economy is it's greatest vulnerability, and other countries could do great damage to it if they banded together and gave them the finger back.
There's a school of thought that the "Axis of Evil", invasions of Iraq and Afghanistan, and the ongoing antagonization of Iran and Venezuela are all demonstrations to the world at large of the extent to which the US would respond to such a move.
Australia wasn't going to send troops into the illegal Iraq war... then they did and within a couple of weeks signed never-before-seen trade deals with the US that were extremely good for the Australian economy.
When asked if he was pressured into making that decision or lose all trade with the US, the Prime Minster looked straight at the camera with a "what was I going to do" expression, and said nothing.
America's economy is it's greatest vulnerability, and other countries could do great damage to it if they banded together and gave them the finger back.