Well before we go any further, please tell me what it is that you disagree? Do you disagree with the empirical, that American capital has been a major source of finance flow into the developing world, or that America's wealth has allowed it to purchase goods from the world, and is in fact the preferred customer of the world as judged by actions of Asian monetary authorities to prop up the purchasing power of the dollar? In that case you are not disagreeing with me, you are disagreeing with reality.
America is poorer than it thought, but even on a purchasing power basis you can't possibility convince anyone that other nations are better off. Who's better off? Is the Japanese business man crammed into an internet cafe to sleep at night because he has no home better off? Is the average Chinese citizen working in factories and are consistently squeezed of their hard-earned income by corrupt administrators better off? Are the Arabs living in deserts better off? Are the aging Europeans dying by the hundreds in heat waves better off?
Financial assets are claims on future income, but the projections for these astronomic cash flows have not owned up to the reality that real growth averages around 2% annually. But still, when you peak into the kitchen of an average American household vs. an average Chinese household, the reality of the situation should speak pretty clear.
The keys words being perhaps "has been" and "was" etc.
The appeal of a currency for the use in International Trade and Foriegn Reserves is based as previously stated on the percieved stability of that currency (something usually helped by the size of the economy) plus the confidence in the Financial Institutions; both State and Private of the country of the currency and the Proberty of the Regulators. This is because you need to use these Institutions when you transact an International Trade in that Currency. Do you FV appreciate that facilitating such deals has been a primary occupation of Americas Global banking and that many commissions, currency exchange deals and instrument sales are linked directly to it?
When you have all these things working well, you have a virtuous circle in which the value, strenght and stability of the economy of the currencies home nation will grow significantly. Sadly however if these things are lost you enter a vicous circle of swift loss and decline and it is this that we are seeing at the moment.
If the Dollar Hegenomy is in retreat, it appears to be being replaced by a series of Regional Currencies, the greater of which being the Euro is which is the main currency for transactions for Oil and Gas between Europe and Gazprom and Iran etc.
Interestingly enough it appears that the Chinese Yuan is being used as International Trade Currency in East Asia itself which is why the PBOC is agreeing to more flexibilty to its tradeabilty in the immediate region and why it is making more Chinese Currency available to the Central Banks of its neighbours, including South Korea and Japan.