Absent other argument, I'd say "where they've been since the 50's" is a good prior to take, no?
To counter-quip: what is the goal? I genuinely don't have any idea in this circumstance how the reactionary right wing adherence to ideology does anything but harm the country they claim they're trying to improve.
I mean, do you want Hyundai to build factories in the US? Everyone seems to claim so. Yet here is a Hyundai factory that seems likely to be shuttered or delayed for years because of... ideology?
Please listen to the NYT podcast I linked. In 1950, immigration had been severely restricted for three decades, dropping the foreign-born population from 14.7% in 1910 to 5.4% in 1960. Then, Congress enacted Hart-Celler in 1965, but promised that it would not increase immigration. According to Gallup, public support for increasing immigration has never exceeded 34% since that time, and from 1965 to 2000, was under 10%. But in that timeframe, the foreign-born population has grown from a low of 4.7% in 1970 to 15.6% in 2024--higher than it ever was in the 20th century.
So no, continuing to ignore the immigration laws Americans voted for and have consistently supported is not a good prior.