As an aside, stranglehold is a bit of an exaggeration. Grads of Ivy+ colleges are disproportionately represented in various top outcomes, even controlling for family SES, but they are not exclusively represented in those outcomes.
But sure, maybe some people want to end even that discrepancy.
However, I also encounter a lot of people who de facto want that placement advantage for their kid when they are graduating from college, they just don’t want their kid to be at a disadvantage when graduating from HS.