In the absence of social factors, would women make up 50% of the tech industry?

You may have heard of this manifesto written by a Google employee, shared around the company, and just recently leaked. The author argues that programs that attempt to get girls and women interested in tech are misguided because women are naturally predisposed to not being interested in technical fields. He argues that we should not be aiming for 50% representation in tech because the lack of women in tech is due to other factors besides social ones like discrimination and gender stereotypes.

What are your thoughts on this idea, and on the idea of going to extra effort to introduce women to tech?

If you have time, consider reading at least part of the linked document before answering.