It seems to me that this is more than enough for anyone to start doubting the US dollar, no matter how deep it really fell into the abyss.
No country or government is going to come out and say "The US dollar is trash!", because their currency is unlikely to be faring much better right now.
I don't know too much of the story, but in the past, US dollar was the king in oil trades; for some time Euro is catching up.
Again, I am not 100% sure that this information is correct, but if it's so, it can be seen as a "declaration" against US Dollar.
Of course, Euro is not really better. I hope to see the day Bitcoin takes over.