The problem is that Pakistan, a major player in this conflict, does not like the northern alliance at all! The day Pakistan's president had that big press conference before the attacks started, he made a big point that the war <i>must not benefit the Northern Alliance</i>. If we're wiping out the Taliban, but Pakistan won't let the NA come into power, who's going to run the country? Could we see some kind of post WWII scenario as happened in Germany, where various countries took over the recovery of different parts of the country? And if so, and Pakistan is a big player, what's India (and indeed Afghanistans other neighbours to the north) going to think about that?
You're being a bit harsh: don't forget the Alliance also includes the remnants of the previous Communist government, who were very liberal as far as women's rights go (something you never hear much about, strangely).