That will never happen because EU has already failed multiple times.
The 2008 recession and accompanying austerity was the first. This austerity is directly responsible for the rise of far right in EU.
The second were the multiple economic crisises from EU countries like Greece, etc.
The third was Brexit.
The fourth was China dumping all its steel.
The fifth was it failure to hold Poland and Hungry accountable for democratic backsliding, which continues to this day.
The sixth was the abysmal handling of refugee crisis.
The seventh was Ukraine.
The list goes on.
EU will never work because majority of EU countries are center right (including neo liberal) or far right. As such regular EU citizens have little to no faith in the system and do not want to die for EU oligarchs
https://en.m.wikipedia.org/wiki/Armenian_genocide
Nazi Germany's inspiration was seeing the 'liberal democratic' world's response to this.
The only reason they didn't get away with it even though according to western 'liberal' world it is okay to do that to your own citizens is because Germany tried to implement the model in other countries.