That's completely incorrect.
Oil prices are high because of increased demand for oil, especially from the developing China, while oil supplies stay about the same, since the OPEC countries decline to release more oil. Importing expensive oil contributes quite a bit to the trade deficit, but you analysis of the current economic system is too fixated on oil.
Personally the Euro has already proven itself as a far more stable currency than the US Dollar. The end of the whole dollar plummit isn't even near I think.
Because the dollar's decline isn't based on internal inflation, but rather, primarily on imports and exports, there are limits on what can happen. As the dollar gets weaker, the cost of imports goes up while the cost of exports goes down, thus, the trade deficit is unsustainable.
The Euro would be the currency most likely to supplant the dollar, if it came to that, but many of the European countries have stagnant economies due to years of entitlement based societies and inflexible economic policies prohibitive to growth. Of the two EU leaders, German has begun to move in the right direction, while France still lags behind. Faith in the dollar has more to do with faith in the economic consistency of the US compared to other countries than it does with fluctuating dollar strength. In fact, as the dollar goes lower, people might be more likely to invest in it because it is cheap now, and likely to go up again in the future.
Then you have the War on Terrorists program of bush which costs an insane amount of cash which results in the national debt to sky rocket to new records every day make the public keep their money on them instead of spending it.
While the Iraq War is expensive and something does need to be done about the deficit, people are not not spending money to hoard it. Right now, people aren't spending money because they don't have money to spend. Obviously, it starts at the top, but corporate losses equal pay cuts and job cuts, which leave the average person with less money to spend. The current economic woes have far more to do with the housing market and mortgage debts than they do with Iraq and oil.