A big problem for YOU. Currencies allow your rulers to manipulate their subjects (citizens) -- YOU. No government wants to let loose of that control. Centuries ago, all trade was done with real money - usually specific weights of gold and silver. Governments took over the coinage, and have steadily debased it.
Anyone thinking that any government control of currency, whether it be national, regional, or international, is going to develop economies is deluded. Consolidation of the currencies means consolidation of power into a bigger world government -- the New World Order (NWO).
The well-being of the citizens-subjects-serfs is not a consideration -- it's all about the power of the rulers.