I can't see what the methodology of the study was, so I'm not going to critique the conclusion, but it's hard not to suspect the panel -- which included a psychology professor "who has long challenged the 'innate differences' view" -- of gravitating toward causes that seem to have solutions. To focus on innate difference is to promote complacency, the idea that there's not "underrepresenation" at all, but that things are the way they ought to be.
But is there a solution for the lack of a traditional wife? I'm sure there are plenty of things, like the scheduling required events and providing on-site childcare. It would also solve the disparity -- not that family related benefits wouldn't still be good -- if men no longer had traditional wives. And I wonder: Do many men in academia have traditional wives anymore? (And what's with the quotes around "wife" in the phrase "traditionally provided by a 'wife.'"? Traditionally, it really was a wife, wasn't it?) In law schools, it doesn't seem that men have the kind of traditional helpmeet who keeps the home and family in order and entertains colleagues. (I'm not doubting that women do more than half of the homemaking.) Maybe in the sciences, in some places, that sort of thing still goes on.
When I think of that traditional model, the first thing I think of is "Who's Afraid of Virginia Woolf?," where the traditional academic wife is royally fed up with the whole routine.
The second thing I think of is the classic 1971 essay "I Want a Wife," by Judy Syfers:
I want a wife who will take care of my physical needs. I want a wife who will keep my house clean. A wife who will pick up after my children, a wife who will pick up after me. I want a wife who will keep my clothes clean, ironed, mended, replaced when need be, and who will see to it that my personal things are kept in their proper place so that I can find what I need the minute I need it. I want a wife who cooks the meals, a wife who is a good cook. I want a wife who will plan the menus, do the necessary grocery shopping, prepare the meals, serve them pleasantly, and then do the cleaning up while I do my studying.Read the whole thing, if you haven't already. It's quite clear from reading it that not only will a woman never find a man who would act like that, but also that wives shouldn't be doing all these things either. Thirty-five years later, do they?