I don't think you get to blame previous governments for not doing stuff when you're six weeks out from completely a full electoral term. It's a bit ... pathetic really. Especially when you try and put a little bit of the blame on the current opposition for not pointing it out during the current term.
Morgan Godfrey at Maui St has, I think, an astute observation. National need to accept responsibility. Not because they put the ship on the rocks but because that's what a government is meant to do - a problem arrives, the government should step up up to the plate and say "this is now our problem and we're going to sort it out".