The common topic spoken  by everyone.when coming to cryptocurrency is that cryptocurrency will make the banking system to obsolete . Even though the current banking system is a flaw and has to be corrected that is not easily repairable A good central bank should be able to avoid hyperinflation and economic depression and should sustain a steady economic growth with slow rate of  inflation .In most developed  countries also it is difficult to do so since they use their power for their own financial interest only .and when people lose trust. over this centralized one there the decentralized currencies can solve all these problems since hyperinflation is not a threat.