Such centralized system most likely will be shutdown by US government. See E-Gold, E-Bullion, Liberty Reserve:
https://en.wikipedia.org/wiki/Digital_gold_currency#Manageme...
https://en.wikipedia.org/wiki/Digital_gold_currency#Manageme...
What if there were two separate entities? One for the currency, and another one for the exchanges? Only exchanges would be considered money transmitters in such a case, right?