The community has different perception on bitcoin. Other may percieve it as digital currency while others it is a form of investment and sometimes both. Well yes, bitcoin could be use to buy for commodities in other areas but for me it is hard to use btc as medium of exchange like buying goods, products or services. This because of bitcoin market price volatility. Most of the business owners had set their price rate and fix profit to which enables them to earn gambling it using bitcoin may loss them in their profits.
And that's the reason why BTC adoption wouldn't really replace Fiat in it's place. Bitcoin is more of a specialized currency that can be used on and off depending on what the situation needs. Yes, the anonymity it provides may prove to be used for illegal purposes, but hell, let's stop generalizing things. Anonymity doesn't mean that it's illegal or anything, hiding your identity doesn't mean that you're doing something wrong or anything. Anonymity is just that, anonymity, no need to paint it black or white.
I like bitcoin, a lot. But I don't think that this world needs it. Except if they want to hide something. Prove me wrong.
Well, Simplest answer would be Central Authorities are also humans. We put them into high pedestals thiinking they are all oh mighty honest people, but really let's be honest, humans aren't perfect, we're greedy, and I expect them to take advantage of their position for their benefits, which includes mine, so I really think I have the right to avoid them when I want to.