"When something like this happens, the board will pay attention," says Eckhaus. "I'm sure the board and human resources and the upper level of the C-suite will look into why this is."
Avivah Wittenberg-Cox, head of the gender-focused consultancy 20-first, is less optimistic. Banks tried hard to improve diversity after the financial crisis, when their every move was under scrutiny, she says.
Now that the worst is over, "the old status quo may be coming back and newly acceptable," according to Wittenberg-Cox. When it comes to the benefits of gender equality, "there are companies that bought it and changed, and there are those that didn't."