Like... parallel societies? Separate school, health, monetary systems? That looks like a brewing conflict once there's a conflict in meatspace that can't be solved in such style.

We don't need to eliminate states. We need to bring down remaining empires masquerading as nation states. Russia shall be divided by separating it's ethnic autonomies, Kaliningrad taken away, Crimea given back to Ukraine. Catalonia and Scotland shall be finally granted independence. Bavarian voices are rather silent nowadays, but why not.