So what? Again, this is a pipeline problem, that can be influenced and addressed via policy. I'm not trying to "command economy" anything. It's a problem that companies, and increasingly universities, don't think that it's a huge issue there not being enough home-grown citizens to fill these roles (a claim I find to be dubious at best). That is definitely something that policy can be used to fix.

>Immigration is the only reason America hasn't stumbled like Europe, Japan, or Korea demographically.

I don't know what this is supposed to mean. You want some demographic growth target to be hit? Europe has many countries in it, but mentioning Japan and Korea implies you have noticed the birth rates there. Well, I think the wrong question is being asked in that situation as well. If people aren't having babies, why? What changed? What policy options are there to fix that problem?

Thinking that "just import a new workforce" fixes that is extremely weird to me, especially when they are coming from places that are not exactly culturally proximate to the places they are going, to say the least.