OK, I started to think about this in the shower after I wrote it. Statistically, there would be some mean period at which this would be expected to occur again, although the variance of that occurrence would be high. It would take someone with way better statistical analysis chops than I to figure out what that period would be, but considering it's a chain of events and therefore a long-term accomplishment (i.e. it's taken us more than a quarter century for us to accomplish it), it would have to be a return period of hundreds if not thousands if not tens of thousands of years, assuming a similar number of cities, teams, etc.
