I think this is impossible because digital currencies are not known by too many people now and many of them still do not know the usefulness of digital currency and do not know how to get it.
Yes, many people do not even know about digital currencies such as bitcoin, ETH and so on. They have not even heard of it, banknotes are nationally recognized legal currency. It is a bit difficult for digital currency to replace legal currency, but I will still look forward to it.