Also how about trying to make a watch that women will want to buy? I just don't see that happening for most women who won't really care about this kind of gadget (maybe I'm wrong).
Honestly, making a watch that will fit comfortably for women would be a step up. Wrist size differences and all.
Part of the problem in doing that is that most women's watches have really small faces. Fitting a usable amount of information and interface onto a huge men's watch (even by men's watch standards) is a challenge already.
Women's watches are smaller, so it's harder to do.