It will not happened even for a decade. Don't worry.
Most people here just expecting too much without looking at the reality and the massive effect of it.
Crypto will grow more but fiat will still be there.
This will take a long discussion so I will leave a simple statement first.
yes, I agree with you even though cryptocurrency is growing rapidly we still need fiat money for daily use. or if one day there is a major natural disaster, the internet and electricity network will be cut off. of course we will need fiat money. I think both fiat and cryptocurrency can support each other without having to eliminate one of them. and although cryptocurrency is now headed for mass adoption. it will take a long time to be realized.