I think saying that women have physiological inferier components that don't allow them perform as well as the men, is B.S. The fact that Alex Pagualyan has such a powerful break shows that women wouldn't have such a hard time in that department. All it requires is good fundamentals. Furthermore I have taught many women who have picked up the concepts far quicker than any man. So don't try to infer that men are more intelligent or far better at understanding concepts, because that is ridiculous.
You can not forget that women have only been allowed in pool halls for a short amount of time. Furthermore it has been an even shorter amount of time since the first womens pro tour was establish. When you learn to play any sport you tend to have a certain idol in mind, you try to equal and or surpass that idol. Most girls learning to play will look at Ewa, Allison, Karen etc, as their hero's. Not very many will idolize Earl Strickland or Johnny Archer, they probably won't be able to relate. Its the same reason why I don't idolize Allison Fischer. I have a lot of respect for her, but Steve Davis is my hero.
As women learn to play they will eventually make their way into the pro ranks, and their abilities increase due to the competition. But here is the thing. It is difficult to keep evolving as a player if you don't keep taking the next step. A B player will probably stagnate if he/she does not attempt to move up and play A players. They may be a great B player, and do very well in competition but they will plateau. If these girls don't have anywhere else to go, if they are already in the pro ranks, then they will stagnate as well. Competition evolves, and so do the players. But with Karen and Allison in mix and dominating, it will force the competetors to get better in order to compete. No proffessional athlete or sportsman is able to accept being an also-ran.
Annika Sorennstein (sp?) was the first woman to average a 67 in golf, now its common. She still dominates but her competition is getting better. Tiger Woods was untouchable when he burst onto the scene, it caused players to practice and get better. As a result of these two, the standard of golf is better than it ever has been. As a result of the top women players in pool, the standard is getting better and better.
One last thing that may have slowed the growth of womens pool. SJM pointed out to me that for every woman who dedicates herself to pool, there are 50 men who do so. With such a small talent pool

D), there is less oppurtunity for someone the caliber of Strickland or Reyes.
Anyways thats my theory.