You are very misinformed. The Ivies take in many low income kids each year many through the Questbridge program. They actually has been putting priority on low income, first generation and minority students in effect taking spots from wealthy whites and asians. (This of course led to recent lawsuits)
Completely agree deck is stacked against low income kids who don't know about, or understand Ivy fin aid. Questbridge and other programs try to fix this.
Endowment and sports have nothing to do with each other. Why should a school be expected to share its endowment with athletes?
NCAA lawsuits are about share of sports revenue generated by college athletes, not paying them from endowment.
Endowment value is driven by time (and no wars). In 100 years Alabama, Michigan, Florida etc will have their own giant endowments generated from the seed money of football and basketball.