It really depends on the bird. I had one bird that was my eternal broody. She would lay 1 (malformed) egg, then go broody. I tried EVERYTHING. Nothing worked on her. When she started losing her health, I broke down and bought her some cheap chicks at Atwoods. She was a great mother! Until she died unexpectedly inside of a safe barn. Nothing got her...she just died. She was maybe 1 year, 6 months old?
Then I had another just go broody on me...she did not do well with her eggs. I think she was just too klutzy. Bought 2 Buff Orpington chicks from the store. They died in a matter of a week. Still clueless as to how...they never thrived like they should have. Booted her butt back to the breeding pen.
I like to promote the broodiness. I want to breed from birds that show it (not like the one hen that died doing it!) as it is part of the breed history and, if something should happen to my incubator, I will have backups.