The fact that the old nation-state system has by now taken a back seat, in terms of what's driving world events, is not premised on any violent overthrow of national governments. The shift has been psychological.
As our global campus or spherical world game board comes into view, as the contextualizing stage, the concept of citizenship remains in play. Analogously, university students sometimes divide into "houses" such as the Greek letter labeled societies.
In a design-oriented curriculum, we study the possible trajectories for key ideas (such as citizenship) by consciously constructing science fiction simulations. How many citizenships might a player be allowed?
An individual currently has a right to Israeli citizenship if either parent is Israeli. Simply being born in Israel is no guarantee of citizenship. In the US system, in contrast, being born within the United States territories is sufficient to gain citizenship, but sometimes without federal voting rights.
Might one attain citizenship without relocating to a specific area, as in the case of a diaspora nation (e.g. Tibet)? In most current legal theories, "diaspora nations" are not recognized. However minors may be granted citizenship in a country without ever having set foot in said country, thanks to parentage.
The legal status of refugees is an issue around the world. When a Tibetan refugee is denied an Indian passport, and protests via the Indian legal system, we see ripple effects. The legal code is hardly static. Like software code, it continues to morph, which is why we encourage simulations (including in software) and intelligently anticipating (versus blindly reacting).