For the 3rd and 4th points, we could rather envision a massive decentralization of power, which would be effectively a change in the model, but not necessarily in a bad way.
Telecom, batteries and local energy production will allow much more flexible forms of local auto-organisations and decision-making.
Parts of centralized institutions will be obsolete or further decentralized to better fit local specificities.
The only irreplaceable aspect of the biggest countries is their military army, but we could also imagine a federation of each state's armies through common interests (which would be something like EU : cooperation of local armies toward a common goal). We could imagine that more autonomous regions with more autonomous armies means less single points of (global) failure.