"Do at least one application cycle completely blind."
Sorry but this comes off as insulting (I know that wasn't your intention), you applaud and agree with him then turn around and pull a "but I still don't trust you". As if PG can't be trusted, or you think that he's secretly sexist and want him to change his successful interview process just to prove himself to you.
I'm positive that women get discriminated in many fields, I've heard my mother's own stories. There's something about seeing a strong woman succeed that makes men feel weak. But this assumption that women are absent or less represented at Y-combinator simply because they are subconsciously discriminated against by Paul and Jessica Livingston just seems absurd. Especially seeing has how politically correct everyone's trying to be now a days. Many people (especially those running Tech Crunch events) are purposely looking for that unicorn female developer to rid themselves of male guilt. The one that's worked on algorithms, programmed since a kid, and coded up numerous apps.
Rather than focus on discrimination ask yourself this: How many times have we seen a female coder's blog? How many frameworks/api/apps have we seen created by females? Is it discrimination or lack of ambition? Take a look at the 10 industries that women rule http://jobs.aol.com/articles/2009/01/26/10-industries-where-.... Are men being discriminated against (one can argue the day care industry) or do they lack the desire and ambition to get into these industries?