Of course! The question is, how many poor and uneducated immigrants would you advocate naturalizing every year in the United States? 100K? 500k? 1.2 Mil? 4 mil? No limit? I feel that until people answer that question (and it will vary from person to person), there's no way to have a meaningful conversation about illegal immigration, which is about setting and enforcing limits.
As for "running out of land"... that's actually a little ambiguous. California could probably triple in population, and we'd still have some rural-ish areas in the extreme north. Japan, because of the density of its cities, actually preserved its rural character in some areas, and this is a country with a population density of 337.1/km2! In other ways, California has already "run out" of land. Ever drive from Orange county down to Tijuana? With the exception of a military base, it's basically sprawl all the way down. I suppose we could increase the coastal population by building high density housing on the coast...
Yes, but how do you prioritize? How do you control the drag on the social support systems of the country? How do you handle the gargantuan task of integrating these people into society?
I'm not completely sure how I feel about the issue, to be honest, but I'm an immigrant (my parents brought me when I was an infant), and I probably wouldn't have made it here under either the criteria that exist now nor the ones you are promoting.
What I know is that the dream of immigration to the US is about having a better life for you and your children. Don't the poor and uneducated deserve that dream just as much as anyone else?