It could happen, but only until women gain more equality. But it's already happening (women in combat, Hilary could win next presidency, more women joining the workplace than men), but the main issue exists with the fact that women's and men's games are so much different. Also, someone who played a men's sport before will instantly garner more respect than one who has not. As far as pure brainpower, a woman genius could probably coach as well from a strategic standpoint. From a motivational standpoint, they are still at a huge disadvantage - and motivation is what could make or break a game (i.e. getting more out of your players than the other coach).