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In reality if they can't sell the model to the broadcaster there wont be a 5th Oz province... bums on seats won't count for much to the broadcaster as they want best/largest broadcast opportunities... So it could only be Japan, which has logistical problems, or Melbourne
Melbourne with their new stadium appeal are a very good chance...ARU have been priming the Melbourne market for years with international matches... There are a lot of Nzers exPats and OZ rugby fans in Melbourne.