If 7 female founder is reflective of the Y Combinator applicant pool, and the only thing YC is doing to structurally to "keep women out" is to favor founders who have coding skills, then the issue appears to be that there aren't enough competent female coders.

Rather than a band-aid solution (e.g., creating a separate model of startup incubator that plays the types of jobs women currently do), if we want true gender equality in the tech space we should hit at the root: getting more women interested in tech. So instead of "XX Combinator," how about more programs designed to get young girls interested in science, math, coding, and entrepreneurism -- the supposed ingredients of a successful YC applicant.

That is, it seems to me that funding a whole bunch of startups run by people who may not be technically qualified to succeed simply because they're women isn't a great idea. Instead, the better solution is to devise ways to get more women interested in the things necessary to succeed (in this case coding and design skills+) and help them develop those skills.

+If you believe the apparent YC philosophy that technically adept founders are better positioned to succeed.