The reunification of the currency is certainly good, but this is hard to come by because it means that all countries on earth have an alliance or just one country left, just like the EU. The former approach is basically impossible because countries have different views Different habits, and then one, for the time being, every nation has such abilities.
Then, ask to European citizens what do they think about the EUR currency and how it has badly affected their purchase power. Or how the Europeans laws are killing the countries economy and why most European citizens now regret their own currency and would like to go back..