Your professor certainly has a good point. As a normative principle, there is something not quite right about the idea that the women's rights movement had to wait for technology to reduce the burden of the role they were unfairly relegated to in the first place.

Besides that, at least in the U.S. the actual demand of housework did not go down with technology. For a long time, the standards for homemaking just went up instead: http://www.amazon.com/More-Work-For-Mother-Technology/dp/046....