> For example if "Google" wanted to make a difference it would actually ban hiring from Ivy League or top-20/30 universities (wiggle room on details here) and instead focus on universities that have higher admission rates (50% or so), large public universities, big time diverse populations relatively speaking.

I would love to see a company do this experiment. It would really put their self-proclaimed focus on diversity to the test! Too many companies helplessly say "Oh, we really want to hire a diverse workforce, but by golly it's so hard and we just can't find diverse candidates from our candidate pipeline of only Ivy-league and top-tier schools!" Focus on hiring from mid-tier state schools and see if that's still true.