It's not a take over or changing Fiat with digital currency, it's only that many of us is making use of hobby nowadays to use crypto in some of their transaction between traders.
So it is happening gradually that people like us use bitcoin as currency and they make daily transaction for all kind of goods which makes price high day by day. So digital currency is now at succeeding poit and even though it is being legal currency. I am sure with high acceptance and government support bitcoin will become more applicable than fiat in near future.
Yeah, That right I think take over here is not replacing the overall fiat as the main currency. I think that digital currency like bitcoin will become more popular in the future, it will be more widely used by many people for investment or for financial transactions, and bitcoin will become mainstream. I think that's going to happen, instead of taking over the fiat position of the world's major currencies..
Bitcoin is already famous enough more than fiat and all other currencies, most of time people have found bitcoin more reliable and easy than fiat or regulate currency, gradually we are shifting to the digital era where almost everything is depending upon online payment system using digital currency, so this is clear for us to be sure that new age will be the age of crypto currency so I think bitcoin is going to replace the fiat currency from the world.