Anyone who has read Cryptonomicon should remember that the hero protagonists went to a lot of effort to secure a large mass of gold to 'back' the currency they wanted to create. The Baroque Trilogy is less clear as Isaac Newton mints new currency. Does that mean that perhaps Stephenson's opinions were always that currency needs to be backed by something whether it is gold or national borders.
Doesn't Snow Crash have hyperinflation followed by a plethora of private fiat currencies?