Fabian socialists in the Labor Party began the dismantling of the White Australia Policy in 1946, with a massive non-British immigration programme, under the guise of populate or perish. Even though nuclear weapons existed, and Australia cooperated with the British in the development of their nuclear weapons, Australia opted for migrants.
Even back then, no doubt the elites knew that this would lead to Australia ultimately becoming Asian, but as good globalists, they just did what their masters told them. From what I can ascertain, opposition to this program was minimal because freedom movement types were too concerned about the communist threat, even though Dr Sutton had shown that it too was part of the plan. Consequently, Australia slid down the road to Asia, and who knows what else.