[rayiner]

This will likely be true in the short term. But experience with other professions shows that the phenomenon will likely be transient. For example, despite the fact that law school is gated by an entrance exam where men outperform women by about the same margin as they do on the SAT Math,[1] law schools have even gender ratios with similar admissions chances for each gender. That wasn't necessarily true back when law schools (and med schools) took affirmative measures to equalize gender ratios, but the very process of equalization removed barriers keeping women from considering the field.

Fundamentally, most sensible people do not want to create additional hassles in their lives by choosing to become a minority. If life in Bangladesh had been as great as life in the U.S.A., my parents certainly wouldn't have moved to a place where they looked different from everyone around them. When women consider going into male-dominated fields, that's essentially what they're signing up for. That dissuades a lot of candidates who would otherwise be promising.[2]

[1] While men and women perform similarly on average on both tests, there are significantly more men who score in the top 1% on each test (for whatever reason). In the numbers-driven world of law school or med school admissions, that factor is outweighed by the fact that women tend to have better GPAs and as a result have similar admissions composite scores.

[2] The same is of course true for men considering women-dominated fields. There are many men who would be phenomenal teachers, nurses, child-care workers, which are solid jobs with good pay, who very reasonably do not want to put up with the hassles and skepticism that would come with being a man in a women-dominated field.