Any of the eurozone members already have a degree of fanatical devotion to their particular subset of the EU. They will stay. A number of others are just too socialist-minded to even think of leaving that empire.
You may be right and I may be wrong.
We will see over time.
As a kid I studied the old Biblical idol of Babylon. Head of gold on down to the feet of clay and iron.
The feet of clay and iron were supposedly non-binding, and would never stick together. That was supposed to be Europe.
The theory may be stricken down over time and proven not to be true, but it’s something that has always stuck with me, and I still nod to it on this issue.
Could be I’ll look pretty foolish as time passes and the E.U. survives.