It is an unfortunate event, it maybe women themselves who cause the low numbers of women in Aikido.
HUH? In every dojo I've been at, in every style, and be it as a member or a one time guest, female sempai were welcoming and sharing and female kohei were happy to see somebody else more advanced.
I think aikido, esp the examples set by the leading instructors both male and female I've met, is very inclusive - I see women advancing through the ranks, I see women called upon equally with men of the same rank for demo ukes, etc.
So I agree that having an all womans short introductory class may serve to bring in women who might otherwise be hesitant, I really don't see aikido as a problem for women. There are individual dojo cultures that are a problem (bullies or whatever) but overall I don't see any problem inherent within the art or in terms of the examples set by most high ranking instructors.