Could you see a future wherein the entire world shares one global currency, be it fiat or crypto? If I think it in a scifi kind of way, it would most probably be some digital currency that could all just use. It doesn't even have to be in this century. Maybe the next?
But why are people so bothered about this? Even if its going to happen its not going to be through Bitcoin or any form of blockchain. It will still be through something physical like the fiat we are using today. And the government will be the ones to decide that and it will also be controlled by banks, so you all should just stop deciding yourselves. We know Blockchain is good but not a lot of people are ready for it.