There is a lot of truth of what you say. Of course, we have to keep in mind that it is actually the Eurodollar where all the value lies, not the USD per se. The entire Eurodollar system more than ten trillion in daily transactions yes have very few actually USD involved.
It is a system based upon collateral and that is why so few understand the monetary system. This is why we see sanctions never work: the bankers have their own system.
RE: The dollar is ever stronger