That's precisely the point I made earlier that will not happen. US Libertarians and anarchists scream bloody murder at the government run financial system and present BTC as the alternative. It's simply not understanding that powerful governments use their financial leverage, like on Russia today, to inflict economic pain on bad actors.
The US has used financial boycotts against the elite and governments of Cuba, Venezuela, Iran, Sudan, Libya, South Africa and others over the last 50 years. It's not about to allow BTC and other cryptos circumvent their ability to do so. The only way for BTC to become mainstream is if government has the ability and (in democracies) the right to block transfers. Judging by its adoption in the mainstream financial system, that hurdle seems to have been overcome, as the Canadian government demonstrated recently.
We live in a world of concentrated wealth, some by unsavory actors. With their pooled resources they can easily create a BTC like system to evade any and all government controls and its exactly why there can never be an extra government financial system.
Please...
Stop it...