If some nation want to progress, they will have to accept crypto.

This quote is constantly bandied about as justification to invest in Bitcoin, and especially now that there has been some nice price movement in the upward direction. But this Warren Buffet quote is only relevant with the proper context, which is that Warren Buffet only invests in things he has a fundamental understanding of and can quantifiably value. You can confidently be greedy when others are fearful if you have a sound investment thesis and are a fundamental value investor. This is how he turns his investments into home runs, he knows what he's buying and what it's worth and can weather the negative sentiment until the market learns what he already knows. This doesn't apply at all to a speculative investment like crypto. Following this advice willy-nilly is gonna get you burned because you're misunderstanding the intent and the application.

Don't not buy Bitcoin if that's what you want to do, but don't fool yourself into thinking you're following Warren Buffet's advice. Warren Buffet doesn't speculate, and if you're buying crypto, you're speculating.

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.