My dear friend, considering that out of the 3800 fiat currencies not backed by gold that have every existed in the history of the entire world not one, not a single solitary one, of those 3800 different paper moneys has survived. Every single last one of those has gone to zero. The money gets printed until it costs $100,000,000,000 to buy a loaf of bread and it dies.
Every paper money on earth right now is not backed by gold, and I doubt any of these will be the first of the 3800 of these we've already tried that actually survives. The probability of monetary collapse of the US Dollar is near certainty. As close to certain as we can get. The only question is how long it will take.
Now gold has been the ultimate money on the planet for the last 5000 years, so usually in the world the rule has been, "who has the gold makes the rules," but not anymore. Now there is bitcoin. It mimics the best qualities of gold as a store of value, and combines it with the best medium of exchange the world has ever seen. Bitcoin is now the ultimate money, the best money on the planet.
Why would ever want to sell superior bitcoins for inferior fiat paper money? If the price goes to $10,000 per bitcoin, don't sell all of your bitcoins and then go out and buy a ferarri with pieces of paper, just buy your ferrari with your bitcoins directly!