Good point, Barry. It is likely that some of the eight survivors from the past four years have returned to the general area. While they will not acquire their white heads and start breeding until they are five years old, in the near future we may witness competition for urban nesting sites. The Everglades simply do not have enough large trees to provide nesting sites.
The adults will actively drive away any of the young from prior years if they venture within their territory, which is said to extend 2-3 miles around their nest.