I don't care that much what admissions offices do, to be frank about it. If they want to put bigoted "holistic"/nonacademic bullshit into their admissions processes, then that's about #43,207 on my concerns list. I don't have kids so I'm at least 18 years from this being my issue and the whole fucked-up mix will be different by then (better? worse? who knows?) I don't think the fault is mostly with the admissions offices themselves. The academic signals they get are not always reliable; high-school grades are hard to standardize, and the SAT is pretty preppable and doesn't go high enough on the math. (The SAT-M should have harder problems that extend it out to ~1000-1100. Or AMC/AIME scores can be given weight in admissions.) But right now, the SAT is too preppable and the relative lightness of academic merit in the admissions process
isn't the officers' fault. They are, as you've noted, working with crummy data. In order to believe they're doing better than they would at a dartboard, they have to convince themselves to "see things" in a bunch of 17-year-old strangers.
What would be of value is to reduce the importance of these brands in the world at-large. It's not that I give a damn either way about Stanford or what it does. I do think the pedigree whoring that has crept into "tech" has been to its detriment. Twenty years ago, Silicon Valley was much less pedigree-obsessed. You didn't need a Stanford degree to raise capital. These days, we see pedigree being the most important factor in the Valley determining who gets to be a founder and who is merely "Engineer #2" on 0.1% of a $5M company, and we see absolute shit founders like Spiegel and Duplan tapping into that private welfare system. A bit of reversion-to-truth in the power given to brands might be a good thing... not only for the world, but also for elite universities, which would be pushed in the direction of using academic merit again, because the mystique they get in admitting rich idiots and making admissions appear "holistic" would be blown. That would be good for them, because it would force them to admit better students.