This is probably the wrong group to ask, because they just go get eggs to hatch for their broodies, but...... is it possible that a broodie will never come out of it if they don't hatch or have a baby chick to mother? Is it possible that they could stay broodie indefinitely?
My first silkie was broody for 3 months before she finally quit on her own. 《arg》
I would think it's possible to be permanently broody but that it would not happen often.