What about the construct of a country becoming irrelevant in that time? Perhaps it will still exist but at the very least will the interaction model (an individual against the concept of a country) of countries in modernity maintain to that date?
I think 0 unfortunately, people are too set in their ways/tribe unfortunately I think
The most likely is a conflict that causes something like Sudan/South Sudan split. Wouldn’t expect any new to to form from the pieces of multiple. Inertia is the most powerful force in the bureaucratic universe
Whatever the number, I hope the people of the world from different backgrounds continue to come together and connect for a greater good.
We already have many virutal nations, and people can belong to multiple nations. It is matter of time with virtual currencies, physics boundaries matter less