Crypto currencies are comparatively cheaper, practical and efficient because they don't involve banks in making transactions so there are no taxes imposed here, but I don't think we can completely abandon the paper because in everyday life we cannot fully use crypto resources. because there are still many payments that can only be made using paper money
It's easy and transparent, yet adoption is not that wide as paper money offers, it will have long way before crypto will be able to be too useful in every means of transactions.
besides that many people who do not understand cryptocurrency, so paper currency becomes more effective for transaction tools. although crypto is easy and transparent but for those who don't understand, it will be the same