When the South Korean minister of finance said the "US dollar could not be sold," he was telling you the truth. Central banks do not hold US dollars as dollars. They hold US Treasury securities in reserve. What the minister was saying was that there is no practical way to withdraw from the system the liquidity injected into it by the Bernanke Electric Mayhem Money Printing Machine.
Should central banks seek to sell US Treasuries, that market would fall out of bed so hard that it would drag the world down with the falling quotes on US Treasuries. Interest rates would spike up so hard, so fast, that in a practical sense major central banks could not sell the US Treasury instruments. Therefore, the minister was speaking truthfully in his statement that the US dollar cannot be sold by central banks.
However, what is happening now is that central banks are NOT BUYING more US Treasuries and diversifying this way. That put the TIC figures completely on investors. As such, everything possible has to be done to keep the stock market chugging ahead because the bond market isn't going to be attractive to investors overseas as the dollar falls and interest rates rise. The Fed knows this all too well so it will keep the system liquid in order to do its part for the stock market.
Man, that was great. I wish I knew what the hell you were saying.