While I like the idea of choosing a male and female characters, I don't for Zelda. First off, Zelda seems to be set in a medieval-ish time period, in which women would likely not be allowed to train to be a hero. I'm not being sexist, I'm just saying that for it to continue in that time, it wouldn't be possible. I know somebody's going to say "look at Impa. She's a girl and she fights." But the thing is, Impa's a sheikah. If they were to make a female sheikah you could play as, it wouldn't be Link (because he is not sheikah) and therefore, I feel, it wouldn't really be a Zelda game. The only "Zelda" Games in which Link is not the protagonist are the Tingle games and the CDI games, both of which most people despise.
That's not to say I wouldn't like having a female character (maybe Zelda) that teams up with Link, with occasionally playing as her. That would be very cool. But an actual female Link as a protagonist... I'll be honest, I probably wouldn't even buy the game.