Because the consequence of filling every labor gap with immigrants is to suppress everyone's wages. You're increasing the supply.
And if it really is a critical industry, being dependant on available foreign labor is quite the risk. There's not really any guarantee they'll want to keep moving here.
Based on this article, I don't think oversupply is the problem here.
Also, the US economy is already overly dependent on foreign labor. From offshoring jobs to manufacturing to onshore labor, every sector of the economy is filled with foreign labor. How many things you own were made outside of the US? How many of your coworkers are immigrants? How many foreigners do you interact with when working on a large project at work?
It's not a matter of "oversupply" or not. The harder it is for companies to hire, the more they are willing to pay, so long as they can still generate revenue at those wages.
Immigrants coming to the US to get shit done in tech are creating jobs, directly or indirectly. And if we loosen the visa requirements so the people on them aren't at the mercy of their employers they won't get paid less than citizens would for the same job.
The only issue is if we underpay the immigrants. If Joe Schmoe American isn't the better pick then he shouldn't get the job over someone in a visa queue.
That's not the reason population decline is a big problem. The real reasons are:
1) social systems can't handle it. You can't have a pension system where more retired people are drawing from it than young workers paying into it. It won't mathematically work.
2) a society with an aging population (where most of the people are old) is usually a society in decline. In a democratic society, it has the big problem where all the old people vote for their own interests, and don't know or don't care about young peoples' interests. So you get laws and policies which basically penalize not being old, plus you get old leadership that can't adapt to modern conditions.
Elon and Xitter suck, I agree, but that really has nothing to do with why an inverted population pyramid is so problematic.
As for Xitter, that (and his idiotic behavior there) wouldn't be a problem if everyone just stopped using it, and let it wither away and die.
Yet in the US we do not identify as British, don’t speak Latin, and <50% believe in god now, down from 80% around 2000, Ai/Ml are threatening copyright regimes, wfh/abandonment of obligation to prop up the war era normalization of industrialization of everything to crank out tanks, and canned food…
Your problem is solving itself. It’s just one of those problems that takes time; which is a euphemism for generational churn
Google “French debt restructuring”. Google Reaganomics looting pensions to deflate the… erm… exiting generation to invest in the kids
There’s plenty of historical examples where humans rethink the social contract without violence
And if it really is a critical industry, being dependant on available foreign labor is quite the risk. There's not really any guarantee they'll want to keep moving here.