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!
The younger generation have greater knowledge and more skills with the new technology, in order for cryptocurrencies to be adopted all over the world as people want then we will need to see a generational change, there are still many people that do not even have banks accounts because they do not trust in banks and while their distrust is justified there are going to be many people that are not going to adopt bitcoin for the same reason and I think that is going to slow down the adoption of bitcoin through the world.