I respect your belief, Matthew, but disagree with your opinion it was a mistake.
I lived and worked in Greece during the bad days of the currency crisis 2012-2014. There was a lot of anger about everything: local politicians, EU politicians, bankers, economists etc. But I never, ever heard anybody say they wanted to drop the euro and go to a new drachma. On the contrary: all my colleagues knew that leaving the euro would hand the windfall of a lifetime to the same corrupt politicians and business interests that had got Greece in trouble in the first place and moved all their money offshore at the first sign of trouble (usually well before that). These people would just wait for the new currency to plunge and scoop up all the good assets at half price. Pensioners and anybody with savings (or with loans in euros) would be left high and dry. See what is happening in Lebanon at the moment for a real world illustration, but the Greeks didn't need that. They know their country and have been round the track before.