Fair enough

ACT, National and New Zealand First have initiated a petition calling for a referendum on the government's planned replacement of the Privy Council by a New Zealand Supreme Court. They'll need 310,000 signatures, so if you feel strongly about the issue, hunt them down and sign it.

Update: KiwiPundit thinks this isn't such a good idea. I agree that the question is rather questionable ("Should the Privy Council be replaced by a New Zealand Supreme Court" would be better), and that yes, the government can always ignore it. OTOH, the clarity of the question (no messy chain of "or"s here) should make it harder for the government to do so if it gets a large vote against.