The discouraging part of this story is that the anonymous letter writer went public right away. To me that suggests more of a personal vendetta than any concern for the company, or they would have given the board some time to investigate and take action. I'll be shocked if "they" (more likely he or she) come forward voluntarily to "help" the investigation.
I certainly think and hope that the current wave of firings and public embarassment is having the desired impact. But instead of more training or discussion, I believe we just need continued action to challenge and apply consequences to offenders. Leaders of organizations at all levels need to walk the talk.
Who isn't in favor of the concept of equal pay for equal work? Among large retailers, at least 3 claim they're already there: Amazon, eBay, and Starbucks. All 3 seem to be pretty successful. Meanwhile, occupations with some of the largest gender wage gaps include retail salespersons and first line retail supervisors. This could be a major opportunity for some retailers to improve customer loyalty and gain a competitive advantage. Let's see who takes advantage of it.