That depends on what NZ standards are? they maybe much lower that Australia's? That aside here is an example of what would happen.
Few countries make cars the size of the Commodore or Falcon, engine for towing and sedan size (5 adults). What you would be offered if they weren't around would be either a small compact probably 4 cyc or a people mover or a 4WD such as the Navara. Now you maybe happy with that but I suspect most families wouldn't. This was proven when the last locally made Mitubishi was released in Australia. It was too small, sold poorly and the rest is history. No one is going to make that size car (Falcon etc) just for Australia. Our market is too small.