i think so, with the rapid increase of internet using in our daily life and as we know that internet will take over and become a major part of our life, the concept of money paper therefore is just become out of place, because everything is just one click away, there will be no place for paper money and other, and replacing paper money is also good for environmental.
Sorry for contradicting you but I think fiat currency will not vanish and majority replaced by crypto, not this near future. Actually, paper money remains much better to use rather than cryptocurrency because it doesn't require digital wallet apps (which have usenames, passwords and private keys) and Internet connection at all, it is mainly made of a paper yet provides a convenient tool for dealing with daily transactions.
The invention of crypto was absolutely awesome because this is a technological breakthrough for us but I think it is not yet ready to replaced our current monetary system for the reason that many still oppose to its concept and besides we can still see loopholes from it.