It's not just luck. Most people I know who started out poor are immigrants whose families worked extremely hard for their sake, and who worked extremely hard in school themselves so that they could get accepted into colleges that offered them favorable terms. There they majored in well-paid fields like finance, law, medicine, or engineering, and afterwards they were able to pay off their debts without issue and live upper-middle-class lifestyles.
It's a lot harder for people whose well-to-do parents refuse to help, but eventually those people do become eligible for financial aid without counting their parents' income (easiest to do by either waiting until age 24 or getting married) and that financial aid will be quite large if they're poor. As I've said, my family wasn't poor by the time I went to college and my financial aid still covered 2/3 of the cost.
I think my experience proves that succeeding without student loan forgiveness is possible, even in difficult circumstances, and that's why I think the problem isn't student loans.
Which family you're born into is luck, and so is innate talent, but how hard you work in high school and which major you choose in college are deliberate decisions.