Sure it is possible,some new technology will come.But that one must repress internet.Even hashgraph should be better then blockchain.But idea of digital money will sty for long time, i think.Some of cryptos are decentralized,like Bitcoin.But more and more,this market is goin to be regulated.In my opinion,decentralized market will also stay for some times ,but in future governments could  try to ban,to forbid this kind of market.What they can´t controll that will be suspended.