I am reading the sexism element that has come into play. Do you mix men with women if you redesign the class toward womens interest? Solution, I feel is an intro class that is a martial art exercise class then work them into a more classical martial arts class. Get women comfortable with martial arts. If you are willing, I think more success would come of it if the regular martial arts class focused on a mix of both men and womens interest. But that is hard, as it breaks tradition and you no longer have a classical martial arts Aikido class.
Questions of income aside (although I know that can be important), I generally feel that it is a bad idea to change your training to accommodate sales and marketing concerns. You never please everybody, and you end up compromising your own training.