yeah there will be great difficulty for the people who do not know about the technology, as most of the people do not know about the exchange of bitcoin to other currency so this will lead to the loss of money from many people, i think both crypto-currency and fiat should exist and everybody should be free to use any of them.
if the old generation no longer exists in this world, then the new generation will dominate, I think cryptocurrency has the potential to become a currency for countries, and of course it will be very interesting, Bitcoin will be to the moon!