"Most do not, and all want to set a harsh example to discourage future departures."


Doug, you need to travel around the EU more and talk to the locals instead of repeating what the globalist, anti-nationalists Eurocrats in Brussels have told you. The EU is not a unified monolith.
The EU itself is imploding and likely within the next 10 years the Euro will not exist. The only country in the EU prospering is Germany. The return of the Deutschmark and withdrawal of the Euro would be the best policy for the non- German economies 
The poor peripheral EU countries like Greece, Portugal, Italy, Ireland have had their economies devastated. France is on life support. Poland, Czech, Baltics, Hungary are averse to the arrogant German dominance.
The EU is gradually devolving and forming a looser association.
The UK is on the cutting edge and will be the blueprint of future EU countries relationship with each other.