Well history suggests some answers to that question
Such as? American Natives arguably fared rather poorly with immigration. What other examples did you have in mind? Other countries don't seem keen on immigration. Is South Africa encouraging Europeans to come over? Mexico and a lot of Latam have difficult immigration laws. Hell I ended having to pay a few thousand dollars to have my Canadian daughter leave Guatemala because she overstayed her visa despite her mother being a citizen. Imagine the outrage if the US started applying fines to be able to leave!
but they don’t have a solution, period.
Isn't it automation plus very very limited purpose-specific visas?