We really have no idea. There are lots of legacy admits at universities, but also legacy students are often pretty good candidates on their own. At my alma mat

We really have no idea. There are lots of legacy admits at universities, but also legacy students are often pretty good candidates on their own. At my alma mater for instance, legacy students typically had better stats than the median admit. So it's hard to say how much removing legacy preference would change admissions. But at max, it is only affecting a few tens of thousands students per year.