for me i think 1 day will come all fiat currencies will be lost and only cryptocurrency will remain
This is evident that bitcoin has come a long way since it has begun and has reached immense heights of success and popularity among people and it has lead to increased users through out the world. But still I dont think that bitcoin will be able to replace fiat currency. Because firstly, fiat currency is way more popular than bitcoins and also has many many more users through out the world. Secondly, fiat currency is a stable form of currency and its value does not fluctuate often whereas bitcoin is not a stable currency therefore its value fluctuate a lot.