While all of this seems to be more of a dream than anything else, there's a possibility it could happen in the future if people lose trust in governments, central banks, and conglomerates alike.
There's a very little possibility IMO.
Look at the country that loses their trust to their government, the country is not progressive anymore and there's a lot of crime happening.
We don't want that to see in the future, that's the reason we elect government officials to implement the law and govern people.
Fiat will remain, bitcoin or crypto might grow but it will not be as acceptable as fiat, there's a limitation on using crypto as whether we like or not, we are still subject by the law which the government has the power to implement it, and let us not think if they still believe they have the trust of the majority, they will always put their interest which they think good for the many, and IMO that is not crypto.