Separating from the scifi cause, it does offer an interesting topic. What happens in society when a defined role or purpose of one sex is rendered obsolete? Arguably you can say that technological advancement has done something close to the male sex. No longer the hunters, protectors, and no longer polygamous, the evolutionary roles that sex typically occupied has been stripped down considerably. While modern males still can fill roles of breadwinner and military protector, it is less defining, so the loss of it has occurred. But while it has changed society there, I don't think it has done so for the better or worse per say. Just changed.
On the female side of things, that has happened as well. More currently (relatively speaking), the evolutionary roles of the sex as child-bearers, child-rearers, and closer to present, homemakers, have changed as well. Children are more often raised by the society in increasing amount of time (schooling systems, etc) so that role has slipped and been less common. Child bearing is still pretty tied near-exclusively to women so less likely that to change while that important biological function is limited to them. As for homemaking, well, that itself seems a change from our evolutionary ancestors tied along with the development of agriculture and ability to establish permanent residences. It changing from that again as the the technology changes is not unexpected. Neither good or bad, it is simply change.
While trends on sex roles and purpose do shift, I think there is another wrinkle of note. We have a choice. Unlike humanity's past where evolutionary pressures drove those roles and purposes, or more recent past where the ramifications of those evolutionary pressures still held roles in a more rigid way, modern mankind is allowed more freedom to choose what it wants in how it lives and what role it fills, not according to sex, but rather to society itself. Stay at home dads are a flip of the recent history sex role of child-rearer and home maker, but it existing doesn't force anyone else to change their sex's role.
I think the conclusion I come to on this is that the roles existed for a purpose themselves, the propagation of the species in the environments they existed. The environments have changed in response to mankind's growing technology and with it the rigid nature of those sex purposes have lessened. You no longer need to be strong to hunt. You no longer need to hunt to have food. You no longer need to gather on an individual basis. Mothers no longer need to be constantly on watch for predators. Homes no longer take as much time and effort to manage. Because of that, roles being aligned to one sex based on biological aspects (males more muscular on average, women more evolutionary valuable because child bearing) are less damning if done, and can even have advantages. Society no longer suffers when the sex roles aren't held so the roles required for the society to function can be filled by either sex more and more.
Humans are the dominant species because we can adapt as a species. Being able to adjust roles in a society in response to our own changes on the environmental conditions is a pretty good adaption. And it also tells that if it stops working, for whatever reason, it could adapt back or in an entirely separate direction.