As we can see the cryptocurrencies are still being established in the knowledge, socialization and full utilization of humanity, could the cryptocurrencies cause the use of physical money to be eliminated, is this possible?
There is very less possibility of this happening in the first place. Because,
1) We are already using the current physical money in the form of digital linking, using credit/debit cards, Internet banking, Mobile Banking etc. So you see we have already achieved some great milestone in the traditional financial system.
2) Also, There is no use of the crypto currency in real world because it is not much stable as compared to the fiat currencies. The stability is really important for the day to day life use. So these are valid reasons for which I don't think that crypto's will replace the fait so soon.