There is no need to remove fiat, when ppls will going all in btc. Governments will have to adapt to get money into the econimics, so they will start adding btc as a legal tender and start stepping up our game. Yeah, that is in long term run, but there is no need to separate fiat or states from a bitcoin imo. At the end of the day, if governents bans btc, ppls will come with new options how to hodl bitcoin, but illegaly. Its never ending run you know,until someone comes along and puts an end to this.