A rep recalc is definitely not going to happen because such a thing would punish people who earned reputation by asking good questions - this discourages participation in the community and is only justified in really drastic cases (e.g. if somebody inflated his reputation score by using a bug in the system). Whatever reputation you gained is yours now, it cannot be taken from you retroactively.
I can imagine the question score to be lowered even further however, particularly for people with many questions and no answers. After all, the system is supposed to encourage people take their new knowledge and give it back. But I don't see it ever dropping to zero - there really are good and bad questions and the former need to be encouraged somehow. Not to mention encouraging people asking good questions to stay with the community even if they don't have enough experience to answer questions yet.