Gender Roles in Relationships

We were talking about gender roles in relationships in class today. Relationships among people are becoming more and more complicated today, including come people enjoy being in an open relationship or never plan to get married. Because of these, roles within a relationship are also becoming more and more complicated. Roles of men and women are switching, or changing. and I think, this is a good sign. Genders become a less important factor in our relationship, women are not expected to be the cooks of the family or men are not expected to support the family anymore. 

It seems to be that we are becoming more and more open-minded about gender roles here in the US. but it also means the meaning of marriage, or relationship is changing among people. Do you think it is a good thing? or should we keep the traditions?