I don't really think the NZR's accountants would worry if they got 45,000 people to Eden Park or 45,000 people to a purpose built new stadium. Since any stadium would be away from EP, the #1 ground can stay until the new stadium is completed. The ground under #2 can be sold off now or redeveloped to pay for the new stadium. When the new one's completed, EP #1 can be sold or redeveloped and paid back to whoever has funded the new Stadium. My biggest concern is that NZ Cricket or Auckland Cricket insist that any new stadium can also take cricket games due to them holding an interest in EP.