Imagine a world where businesses, merchants, and everyday people use crypto as the only medium of exchange. Everything will operate autonomously and decentralized without the need for third parties. In this world, governments and big corporations might cease to exist as everything will be guided by both Blockchain technology and AI.
I don't know how switching from fiat to crypto will result in such a drastic change. It's just a means of exchange at the end of the day, and they've historically been able to adapt to changes.
As for blockchain technology, there hasn't really been any widespread application that doesn't have anything to do with cryptocurrency, so there's not much to suggest that it can guide a new society lol.
Anyway, part of why the world is struggling right now is that people have been reluctant to part with their money; people are mostly restricted to spending on essentials. A world with
just crypto might mirror this, except people will be reluctant to spend because of crypto's deflationary properties rather than a global pandemic. I guess inflation could be introduced to address this, but depending on how new coins are issued, things might not end up too different from fiat.