Crested Pigeons being affected by sterility

I was hoping to see little babies of the Crested Pigeons this month but the female who was sitting on eggs has abandoned the nest altogether. Not only did she abandon the nest she wrecked the nest too. This occurred about 3-4 days ago. Either the male or the female is sterile because no chicks hatched whatsoever. I don't know which gender of Crested Pigeon is sterile.

It's strange but no Crested Pigeons have successfully hatched eggs in Tenterfield, as far as I can tell, for at least 5 or more years now. As soon as the adult population dies out naturally Crested Pigeons will become extinct in the area. This may be the first ever recorded species to actually go extinct. There is only one solution to this problem  to prevent this species from going extinct, and that is the introduction of fresh blood with younger and fertile birds.

For the last few days I have not seen or heard Crested Pigeons anywhere nor have I seen any fledglings. Did they leave the area? Where did they go? I have no idea!