I've kind of had a little thought in need of opinion over economy. So..

Do you think that the use of a Fiat Currency [(money that's only worth what people believe it to be)] could substantially impact the value of actual worthwhile material?

As if, for example, a nation that has always used gold and/or silver as currency decides to begin using paper money much like others. But after only forty or so years, and for some undefined reason, it is disbanded by everyone, who simply return to the ways of payment before.
Would the use of the paper money in that nation after so and so amount of years cause the gold and silver used before to be worth quite a bit less or even more than it actually was? Opinions?

hanz0 suggests defining fiat currency for the benefit of others.

Fixed.