Why do people think Bitcoin has to replace fiat currencies? It's a twisted way of thinking, because there is more than enough room in the world for different sorts of money to exist. Governments are out to exterminate competition, the last thing we should do is follow them, because that makes everyone here just as bad.
Sickfucks such as Craigh Wright would be up for it, I'm sure, otherwise they wouldn't be teaming up in an attempt to kill off competing crypto currencies by attacking their chain and mining empty blocks. Not sure to what extent these plans were ever viable for them, but even thinking of doing something like that indicates that we're dealing with toxic entities.
In the end, the US dollar won't be killed off by a competing form of money, but will be killed off by itself because fiat currencies have a limited shelf life.