There is that - my broodies have to be OK with being moved to a dog crate inside the house for their last days of sitting because I no longer have the knees (and other parts) that are going up and down the stairs of doom to check in regularly, and there's only so much the camera will show. A few hens don't make the transition but most do fine with it. My sigh of relief is when the hens talk to the adopted chicks- once that happens it's all good. Maybe a couple would have completed the cycle if they'd hatched eggs in the coop. I used to be OK hatching in the coop until a broody chucked a hatchling out of the nest and it died - and she abandoned the rest, and from there on out the rules changed.