2. It's not that only men can ride it, it's that it's already full men, which is the current situation. Most people trying to get jobs in the technology area are men.
3. The elevator would be policies that help women in the technology areas. Be it affirmative action, or programs designed to help women in the area.
4. Because if you allow everyone in the elevator it would be full of men once again, and a line would form, with the same situation that it's happening in the escalator. If you could manage to make a line where people all queue correctly, and cancel both escalators, you would lose the current situation where people more skilled get to the second floor first.
I thought it was pretty clear. Did I manage to explain it better?