Credit where credit is due: the EU gets a lot of flack for being bureaucratic, hidebound, sclerotic, whatever, but the single currency has been a success and it's still expanding, 26 years after its creation.
Also, the addition of Bulgaria means it's almost possible to travel from Spain to Greece entirely through the Eurozone, with only a thin sliver of Serbia or Macedonia in the way. (Assuming we include Montenegro and Kosovo in the Eurozone: technically they aren't, but for all practical purposes they are.)
It'll also be interesting to see who's next. Czechia is not far off but doesn't seem to be in a hurry, while Romania wants in but still seems to be a ways off. Poland and Hungary will stay outside unless there are major political changes.
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