This is going to start the race for the door.
The problem is, not the US investments, but the local economies of the huge dollar holders. China has been hit hard by the depression, and the government there is going to have to do some of its own stimulus. Selling dollars would be a good place to start to get funds. Also all the OPEC places that are facing oil prices at $45, when the economy there needs oil at $60 to keep the system going, they will be needing to sell too.
What we have now is everyone out there needs to dump their dollars, but when the thing starts, it will feed on itself. No one wants to start the rush out the door, no one wants to be at the end of the que, but everyone is watching each other real real close.