Though Bitcoin is a very promising commodity, still I think it cannot replace the real money. For one, any government will not hold anything that they cannot control and bitcoin for that matter is an example. It is a decentralized currency, meaning no one has a direct authority over it.
What if people all of a sudden stop using the paper money ? All of a sudden everyone wants to keep trading/paying stuff with cryptocurrencies.. which means that paper money will be out of use and banks/government money printing facilities will stop working.How are governments gonna deal with that ?