Legal frameworks are transient in nature, as with all phenomena at the fragmented level of "reality".
I disagree, I believe that in order for a smooth transition to occur, parity is the best possible beginning. Check the monthly charts, its screaming parity. Perhaps a lesson learned, or a pre-determined outcome?
Having said that, everybody has an opinion (thats what makes a market, apparently).
There is too many advantage for companies and countries to have different currencies. There will not be a unique world currency in the next 10years (at least)