As a software developer in the Dallas metro I make over 6 figures, twice the average income. The work isn't that hard and the perks are amazing. At EVERY software development job I have ever held I have worked with a huge number of immigrants.
If the pay is so damn good (already) and the benefits are so damn fantastic why aren't more Americans writing software? Why aren't so many of those people who are writing software so incompetent?
I get asked all the damn time by young people in my side job how they can become software developers so they too can make the big bucks. Simple, put fingers on keyboard, struggle, and figure it out through practice. None of them follow through. None. Some of these guys make far less than the national average and they still aren't motivated.
So let's propose a hypothetical. Let's say entry level were $150,000 and senior were $500,000. A ridiculous increase. Would more people be interested in programming: absolutely. Would there would be a substantial increase in senior developers? I suspect there would be a minor increase, because it takes effort. Competence isn't a gift and gifting additional income won't work.
Now, I could be wrong, but as it stands all the objective evidence is on my side on this.