an interesting doco on You Tube,
http://www.youtube.com/watch?v=k1oPEfa9Lws
about the history of the USD being the world's reserve currency and why its future is now pretty uncertain(according to this short film).
And in addition to this, remember the last gold bull run of late 70's/early 80's(I don't, I was 4!). Anyway, it surged as the USD fell due to inflationary pressures just like now. People are suggesting the AUD might reach parity with the US......in the early 80's it got to about 1.30:1 with the USD, which is roughly another 45% from where it is now.
I'm not an economist or currency trader but i would listen to someone like George Soros.