So three quarters want the Euro lol.
The EU has grown rapidly to 27 countries and a population of 500 million or so.
It’s no surprise that in a time of rapid global change that it is facing challenges. I have no doubt things will work out. The reason why it may seem ‘unstable’ is because it is a democratic club of many nations and there are different voices and opinions on how to face those big challenges. I think the migration challenge is finally being faced and the EU and Germany in particular realising they can’t fudge it anymore and depend on countries like Italy and Greece to accept the current situation .
If we wanted stable should we be more like China or the US ? Or Russia or Turkey ?
Would leaving the EU make an individual country more stable or Europe itself more stable ? I dont think so.