Voltaire observed centuries ago that "all fiat currencies eventually revert back to their intrinsic value-zero."
I'm confident that the American Dollar will cease to exist in its current form within a decade (probably sooner rather than later). John Williams of ShadowStats believes that the American Dollar will begin to hyper-inflate in 2014.
Currently, I'm trying to figure out whether the other fiat currencies will implode along with the USD (since all fiat currencies are either implicitly or explicitly tied to the USD). Specifically, I'm trying to figure out whether the CND will implode. My biggest concern is that our CND is backed predominately by USD paper assets (IRRC >80% of our reserves are USD based) and our government sold most of our gold in the '80s. ATM, I believe that there is a very good chance that all currencies will implode in some fashion along with the USD but John Williams believes that the stronger fiat currencies (Swiss Franc, AUD, CAD) will hold their value better relative to the USD.
One of the most interesting things going on right now is that the SCO (Shanghai Cooperation Organization) countries are gobbling up the world's supply of gold. I believe they are accumulating as much gold as possible to back their currencies with gold when the reboot takes place. John Butler's new book "The Golden Revolution" goes into great detail about this.