A singe currency is as feasible as world peace.
China, Russia, the UK, the US, North Korea or Japan will never accept a currency out of their direct control.
Readers don't read, or lack reading comprehension.
Why don't you try again to read the thread. The national currencies will float against the reserve currency.
I've understood the subject.
So that new reserve currency would be pretty much like gold. But no currency is pegged to gold any longer, and you may say that all national currencies are currently floating against gold, or that gold floats against each national currency, but few countries will accept that this new reserve currency shall be the standard against which all the others should be measured. Setting a reserve currency requires a consensus to begin with, but that doesn't exist at this time. Questions to ask is what authority could say this is the new world reserve currency, and why should countries accept it as such.
This topic should not be in "Economics", but in "Politics".