Lets say crypto completely and utterly replaced fiat. Fiats don't exist anymore. All governments have seen the advantage of using digital currency and have completely changed their fiat into crypto, like dollar to dollar token(obviously not tether). How viable is this? For example anyone can see how much I am holding using the public ledger and track me down and force me into sending them the cryptos I hold. I wanna discuss in reality if cryptos actually replace fiat how life will be and what are the problems we are gonna face and the immediate effects of it.
You know what it will happen soon in the future.. That cryptocurrency will replace tha fiat money especially now that a lots of people knows how cryptocurrency works and how important it is in the future.. This will become great if it the government will support us with this... Because if they are the one who will help us and if it is truly legalize by lots of country bitcoin will surely replace our fiat money...
Let's consider the facts. This forum is the largest forums for bitcoin and there's about 1 million users in here. A good percentage of which is inactive. Look around, has someone paid you with bitcoin in exchange of something in real life? I never had that. My family knows about cryptocurrency. But simply knowing crypto doesn't really lead to actually using it. There's a million users in this place, there's 7 billion people in the world. We are nothing when you looked at the bigger picture. Famous youtubers has more subscribers than the community of bitcoin users.
Another thing that's wrong in your post is that you mentioned that legalizing bitcoin will surely replace fiat money. First of all, it doesn't. In Korea and Japan, bitcoin is legal. These are two major countries when it comes to the online world. Yet, we don't see Japanese Yen and/or Korean Won getting replaced by it. (You can check the legality of bitcoin per territory
here.)
I don't see bitcoin invading a good percentage of the population especially now that we still have a digital divide going on. There's a lot of new users coming to the bitcoin world these days. On the other hand, there's just not enough people yet to make crypto replacing fiat possible.