Cheap labour may no longer come to you. Rich western nations may be souring on immigration . Longer term, the global supply of working-age people will shrink . Services inflation outstrips goods inflation , particularly in areas which are hard to automate.
Arnhem Land, Australia, 1650: expat Makassans run trepang processing plants with their local joint venture partners. Even after white settlement, during Australia's supposedly 'pure' settler period, you had Chinese on the gold fields and in veggie gardens, and blackbirded Islanders on sugar plantations. Even the most remote societies have always been multicultural, to varying degrees. Tribes since the dawn of humanity have bumped and mingled. Nudge nudge, wink wink. Steppe people, no! The notion that multiculturalism erodes social cohesion is therefore false. So what actually does?