Maybe that is possible in some countries that legalized digital currencies.
But, i don't think digital currencies will replace fiat in international economy.
Maybe it will become as an alternative medium of exchange.
There are some possibilities that digital currencies can act as alternative payment method because of its convenient transactions.
The biggest problem that digital currencies encounters is there are some countries that prohibits transactions using it.
Digital currencies will replace fiat if all countries don't prohibit transactions using digital currencies.

It can be possible that fiat will be gone, but it wont be defeated by a decentralized digital currency, it will be the same, the difference is just that we will only use credit cards and digital money. But Bitcoin wont defeat fiat, it just is not possible and Bitcoin now as it is isn't very good for a global  currency.

Yes I believe because it is now gradually recognizable. So we expect that much will be good and it will be near. Our payment method can be changed. And our main money will be crypto

No, fiat will not be replace because it is already build a deep foundation between all the people. Fiat is very convenient to use by the old people, poor and rich people or even the children can use it easily unlike bitcoin you will need the internet, digital technolgy and most of all the computers to do the transactions before you can use it to purchase but i hope it can be replace someday when all people will only rely to the computers.

I don't think so. Because Digital currency is now more popular and well known all over the world. It's a big foundation between all the people. Fiat will not replace Digital Currency. Fiat can not it. Because the digital market is an open source platform around the globe. Somebody or someone can make it true.

Yes. I believe that cryptocurrencies are going to replace cash in the future. We already have bank accounts in which we have digital money! I would say that cryptocurrencies are much safer than fiat stored on bank accounts. We are our own banks, we are responsible for security of our money and I'm optimistic about it. Strong encryption can't be easily cracked.

Globalization reaches out rural areas in attempt to urbanized them. But it is not fast enough because of several factors. Crypto currency cannot fully replace fiat unless everyone is in favor using it. There are government officials who doubt the idea of using crypto currency. With the issues that BTC faces right now, it is not yet capable of trying to fully replace fiat since its value is also dependent to the demand. May be in the future, where every one already have enough knowledge about btc and every city/town have a more advance tech.

Bitcoins replace will be almost impossible as of now or in near future because fiats are used mostly everywhere,they are know and trusted by people who use it and also that the are quite convenient for daily needs and buying stuffs near by.Also that different fiat has its own values according to its market and economy which will be quite impossible to replace all this to bitcoins and I also don't think so that there any need to as both are great at what they do, bitcoins are great for large amount transfer to who ever with minimum fees to any part of the world.

I think It is not Possible, Actually we need both of Bitcoin and cash money. It is not possible to replace fiat.
Actually Blockchain technology is a fear process and it in not stable globally, and no govt. will agree to accept a fear, untraceable exchange service for their people. Electronic currency can never replace real money.

maybe yes and maybe no!
but I think bitcoin will NOT
fiat or local currencies is the one who used in certain country and it is use to audit and see how the growth of a certain country have
economy is which money will be used and to buy local to local country and local people to be paid

so I think it will not replace but instead be alternative way of money