Should New Zealand become part of Australia?

They're our closest neighbours and we share a history and culture going back more than 250 years. So should New Zealand formally become part of Australia? That was a suggestion put forward by parting Labour MP Jamie Strange during his valedictory speech last week. Professor of political science at Charles Sturt University in Australia Dominic O'Sullivan, who is also a New Zealander, thinks we should at least think about before rejecting it out right.