First of all, note that this argument works both ways. You also can’t put exact numbers on how many women we’d expect there to be in the industry in the absence of any sexism whatever. So how do you know that there’s no problem?

But actually, the question is quite easy to answer for me. I am more interested in sexism per se than in the gender distribution. When women in the industry infrequently report that they are experiencing sexism, then I’ll consider that we’re well on the way to solving the problem. The current gender imbalance is a symptom of the problem, not the problem itself.