So in a governments aim to control our money it will leave a big opening for bitcoin and other decentralised crypto to exist along with fiat and will allow people to "trade" anonymously with each other over a completely independent infrastructure.
Bitcoin is examples of open cryptocurrencies. Everyone can see how much money you have on your wallets, how much it you send and who gets this money.
Technically we cannot know who is holding that wallet which mean we are really anonymous but in terms of security we are not because of KYC. Fiat money is very important because not all people knows how to use cryptocurrency but I think our future with cryptocurrency is pretty amazing.
Our future is surely attached with bitcoin, if we will save bitcoin it will get high in price, bitcoin has a lot of wallets which keeps it safe from being hack and all other problems of holding and rising, we should make our bitcoin famous more than fiat because it gives us security of holding and promising us to be high more than anything, our money gets double within few months so nothing is better than bitcoin these days so bitcoin is future currency which is gonna rule all over the world.