From many months i am thinking about what if " we remove fiat system , and change things into crypto " .. What are the main difficulties we will face ?
1. Internet every where is not yet done.
2. Awareness with Crypto ( but its not a big thing, as most are aware of how to use currency. )
3. Bitcoin is only 21,000,000 and world population is more. ( This can fix by other altcoins same like USD/RUB/CNY etc )
What other difficulties we can face ?
One currency economy would lead to nothing but war, destruction and obstruction. One more problem that the crypto economy might face would be the results causes by the end of net neutrality. And to add to your first point, internet is essential but there are not enough resources for people, so care about internet later first, let the being live peacefully. Spreading an awareness to people about crypto would be something that would be impossible to do, everyone has their own understandings, it'd take forever for any economy to embrace crypto as it's main currency. There are tons of issues, we are just not seeing them.