if something depends on Fiat it cannot replace Fiat !
the only crypro replacing fiat would be one with a fix value -- maybe connected to the goldprice .. and then split into nation-values (started by giving them the value of the BigMac Index)
If I want to pay with cryptos .. the only way to replace fiat .. and build up an alternative economy then I need a coin which keeps its value .. If I sell my car for 2 BTC today and this could be 120.000,- Euro and tomorrow the US government sells the 1,5 Millions BTC they own after the raid of Silkroad then my 2 BTC will have the value of maybe 2.500,- Euro instead of 120.000,-- and what can I buy for 2.500,- instead of 120.000,- ???

To build up a real alternative economy we must become independent from fiatmoney .. and one thing which is protected from all sides -- also by the elites -- is gold. so a goldstandard-covered coin would be a beginning to have a value .. and if Fiatmoney crashes, if - or when - we go into hyper-inflation in 2 years or whatever -- a fiatindependent Coin would survive and give people safety of what they earn or spend .. and only this way we can replace the fiatsytem !

Its really amazing what people DO NOT understand about the money system !