Only if your only criterion for success is diversity. I don't think the intention has ever been to recruit evenly from all zip codes or whatever. My understanding is that the idea is to have a substantial portion come from a less advantaged population. (Heck, these universities still need to have a lot of wealthy kids so their families give them lots of money. A dozen self-made millionaires aren't worth much compared to a handful of trust fund billionaires.)

If I flip your numbers around, it actually sounds pretty good: a full quarter of the alumni come from the bottom 80% of zip codes!