>part of the force resulting in net negative low skills worker immigration.

That assumes that these workers are coming from countries where opportunities for paid work are equal to or better than those available in the US, and are equally lucrative. Many workers come from communities destroyed by the drug wars, or from economies ruined by corrupt governance. If those structural factors don't see improvement, the impact on net low-skilled migration to the US won't budge much.

Understood, but if there is no market for their labor due to structural changes in the economy (automated taxis, automated check out, mechanized fruit picking) as well as a better educated domestic workforce (high school grads) now willing t work at $15/hr what jobs exactly would they be coming for?

People in desperate situations aren't going to be stopped from coming to the US because the Fed/WSJ/BLS says there is no market for their labor. Migrant communities are extremely resourceful because they likely have experience in finding opportunities that others would pass on.

For a lot of people, decision making is based on which option allows them to just live another day; relative to their circumstances, we are exceptionally privileged to be able to make decisions based on the extent to which macroeconomic indicators impact our standard of living.

You're thinking about the state of the economy today and yesterday. Maybe you're only thinking about people who grew up south of the southern border. Low skill immigrants come from many places. Many pay lots of money to get here, if they don't see a market for their low skills, there is no reason to come here. Low hanging fruit [low skills jobs] are being replaced by automation, slowly, but it's on its way. Currently there is a net negative low skills immigrant flow. As automation accelerates, it's likely to increase low skills immigrant outflows. Conversely, we may see more net inflows of mid and high skills immigrants.

And, as minimum wages go up, high school graduates become more willing to work. At $10 you may not find manual labor worthwhile, but at $15 it looks more enticing. Now, immigrants typically work a little harder, but not so much to overcome a lack of education and poor communication skills --which can take years to develop if Eng is not their native lang.

As tech advances and "hollows out" low skilled labor from advanced economies, these economies will struggle to keep their mid skills labor market employed.