The reason why we have inflation and debt is to keep the value of our currencies stable. IE, if people want to use dollars, the US government can print more dollars to satisfy the demand. (And thus keep the value stable.)
Cryptocurrency's volatile value is a result of its inability to "print money" when more people want to use it.
Remember: Currency is not an investment. A good currency has a stable value over time; otherwise it's very difficult to conduct commerce.