Right, it's been used by many generations and survived countless wars and natural calamities. Paper money will also overcome the threat of virtual currency which only exist in the digital realm. The future remains bright for the fiat for its availability, portability and convenience.
what you said is true some country are printing the fiat money with out the fundamental of the policy but i think paper money will exist as most of the bitcoin users are also believing that storing bitcoins in paper format is most secure then obviously instead of fiat paper money we will be using bitcoin paper for all transactions in future if bitcoin comes to main stream.