What would be the reasons for the USD to fail? The only one I could think of is that the Union would disintegrate, Balkanizing the country, but why would that happen? You know the Euro since it's beginnings was given only a year before it would collapse and since then every year someone says this is the year the Euro fails and yet it's still working.
Exactly, I'm also beginning to contemplate why would the USD fall and not any other fiat currency in the world because should that happen then all currencies in the world must have been wiped out already and there wouldn't be a basis for holding the USD. Bitcoin is decentralized and are controlled by the people who have invested in it and so it is independent of all other currencies.