I don't think you're really disagreeing with the parent comment. In order to remain at a constant level of profitability with a price reduction for all students

I don't think you're really disagreeing with the parent comment. In order to remain at a constant level of profitability with a price reduction for all students, universities would have to reduce the benefits given to students (e.g., larger class sizes, fewer building upgrades). This would negatively impact the student's likelihood of becoming successful (like you mentioned), and would potentially cause some high-potential students to switch to other schools. Brown is trying to get the best of all worlds: let the rich pay full price to maximize income, invest heavily in students to optimize chances of later success, and subsidize education for less wealthy students to keep the applicant pool as large as possible.