What do you think will happen?
Who knows?
Back to tribalism (as is my guess)?
Some people suggest that and have been doing so for decades. Tony Blair wrote well about this 30 years ago and I also recommend to you the book "Tribes" by David Lammy, the British Foreign Secretary.
Or the building of the "Festung Europa", an impenetrable wall around our outer borders?
That won't happen.
will just accept everything
People haev 'accepted' fascism, communism and exploitative capitalism in the past. Most humans are conformist and do what they're told,.