If currencies are going to crash, then you have to ask 'relative to what?' since they essentially trade against each other. They would fall relative to commodities: real goods, like oil, gold, and food (minus the industrial materials, like steel, which can suffer a demand drop). As long as energy prices are as low as they are now, there are billions and billions of additional dollars in the economy that people can spend. The dollar is not going to crash as long as energy prices are low. When you see oil prices shooting up again, testing new highs, cutting down on peoples' ability to move themselves and transport goods, when airlines are going bankrupt again and gold is shooting up also, that's when things get interesting. With the cheap oil source in the U.S. right now, just watch how long that lasts. It could be three years, five years, or ten years. The dollar will be strong until then. In the end, it's all about energy.