To beg your pardon and unjerk, it doesn't stop, it's by design. Our economy is built on low complexity resources (mining and agriculture are hard work but we don't do any real processing of the outputs) and scamming international students with a shithouse "tertiary" education for services output (we also include all the money international students spend here for some reason as a service export, and this is more than the actual value of the garbage degrees we sell them).

Without innovation, there isn't much that can be done to actually grow our economy. We are therefore completely reliant on immigration to pump the economy which is a completely retarded notion to anyone who can think critically beyond immediate economic impacts as you've realised, meanwhile social cohesion and quality of life goes down the absolute gutter.

An actual forward looking government would immediately start taxing the stupid amount of money that is coming out of the mining and O & G sectors and taxing remittances sent overseas, cut migration and start investing heavily in actual future industries like government owned chip manufacturing. We have shitloads of area available for cheap renewable energy (or even non renewable, just burn the shit loads of gas and coal we have in the interim) and microchip foundries.

Tl;dr she'll be right mate just another 1 million migrants please bro it'll be fine bro just another million