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That's a bit surprising as it means that attendance at that AUS vs RSA test in 2017 would be capped at around 22,000 (the capacity of NiB).
The best attended test against RSA in Perth was at Subi in 2005 (43,278).
Attendances at the last 2 tests against RSA at Subi have been 34,377 in 2012 and 25,718 in 2014.
22,000 is a fairly pessimistic assessment by the ARU of the likely attendance at future tests in Perth, especially tests against RSA (which are almost home games for the Bokke, given the number of South Africans who live in Perth).
Will rugby tests post 2017 be held at the new Perth Stadium, where capacity in rectangular layout will be around 65,000?