Since the dollar is no longer backed by gold, central banks no longer have the choice to obey the law of the dollar, they can't even convert their money into gold, since there isn't enough of it anyway. The US has mass printed banknotes without a reserve, keeps half of the international payments in dollars and continues to spread its dictatorship.
The USD purchasing power is failing and will continue over the years. Who wants a currency that worth nothing?
The US debt seems unstoppable and it can only lead to inflation
But now there are many countries trying to get rid of the dollar and its monopoly. We see some examples recently with Iran, France, China,...
What couldn't we do the same, as citizens, with our own currency (Bitcoin or whatever)?
Yep why not. There is nothing more valuable than BTC today which is more rare than gold as well and we all can also acquire. Any government can set up their own mining farm including banks so that they can get as much as they want and release fiat out of these BTC they hold. This is going to be more transparent for the world to see the reserve of every country in the blockchain.