The original framing of the 'out of Africa' hypothesis is not quite a universally accepted theory. That a movement of Homo species from Afric into Asia, Europe , Oceana, etc occurred seems very likely; it also seems possible that subsequent interbreeding with other Homo sp. occurred beyond Africa, possibly even speciation into H. Sap.Consistent with the universally accepted theory that all humans have African origin, it seems humans somehow crossed the Wallace Line 40,000 years or more ago. They must have been at that time more technologically advanced than other humans. There is no evidence that other humans built efficient water craft that could cross the 50 km wide straight (at minimum sea level) for at least 25,000 years later.
I'm open minded on the subject and have no ax to grind. Without including Mobio and Population Genetics (along with Linguistics, dirt Archaeology and actual History) any comprehensive discussion would lose its way fairly quickly.
Thanks for this input. The SW spread of the Austronesians was what drew my attention to their apparent bypassing of Oz.All the islands around Australia were settled by Melanesians, not Polynesians. Polynesian island settlement started north-east of Australia and gradually came south till the final settlement was NZ.
***@specul8: That the ancient North Coast is now largely submerged might work in favor of Underwater Archaeology turning up some info. It's a long shot, but what ain't that far back.