If I understand your question correctly, you've put out all of your available goblins, and didn't kill all the chicks, and now you are asking if it makes sense to continue the run if they kill some of your goblins, or is it more beneficial to discard the run?
I'd think of it like this - if you have goblins with high attack left, and you can kill the chicks while having them alive - the run still has potential for a win, if the chicks killed your high-attack goblins - I would discard the run