Gonna necropost this with a bit of food for thought.
What would the narrative be as we traverse the different districts? Would every single character be transferred between the different iterations? What would the justification for this be, should that be the case? If it isn't the case; who gets to stay and who gets to go? How will it be monitored if people obey these restrictions?
I love the idea of having the city at a larger scale with multiple districts, but I do not see it as technically nor IC'ly / Narratively feasible at the moment until we get the update working (which is probably far into the future) that links multiple servers together (Cross-server plugin).