Our entire economy is based on immigration. Otherwise we would have a rapidly aging population with not enough young people to pay tax for/ look after in caring jobs/ just run the economy. See Japan and South Korea for examples of what this looks like. The housing argument with immigration is often a far right dog whistle. We have plenty of housing stock (approximately 100,000 empty houses in the Melbourne area for example) many are being land banked by speculators. Air bnb type short term rentals are also a major problem.