It might not be in 5 or 10 years but it's inevitable. It's not going to operate like this for 50, 100 years.
Just run a mental simulation of WW2 playing out except Europe had the EU.
So while I agree the EU is becoming more an more normal and important to the average citizen, there will come a time when it has to either solidify further or break apart, and I think it's basically a crapshoot to predict how that will go now when we have basically zero info.