Hmmmm, how about a personal experience with our family? I feel the blurring of gender roles has provided a fairly good balance for us! Although I would say that my two little girls are certainly entrenched in traditional female gender roles, we consider them to be fairly well-rounded in that we are very proud of their more masculine interests.
For example, my oldest has always shared a HUGE love of Star Wars with her Daddy, ... less interested in the love stories, ... more interested in the rescue methods. The irony is, her name is Leia (although she doesn't care for that character at all in that she prefers Ahsoka Tano). Leia also adores dinosaurs and has since she before she could talk. But you know what Leia likes to do for fun? Ballet! My youngest, Annie, is the gal who loves cars. She loves nothing more than to take her little girlie ponies and figures and parade them along a "parade" of hot wheels muscle cars. Ha! Such a great combination of the genders!
Thus, the blurring of gender roles has created a more well-rounded family in our household and a fairly good balance. Both Mom and Dad contribute to the family by working, ... dad at the lab and mom at home on the computer (on her own time). Our girls know that any profession is open to them. However, I always laugh because, knowing our family line, I'd be REALLY surprised if either of them got into sports. If they do, though, all power to 'em! : )