It is unlike that wee will receive any other answersd form MM than “the gemara says it”.
I understand his dilemma.
Many women may well not wish to believe that the only way for them to merit Olam Haba is through the actions of their husbands and male children.
They may well get the idea that they can merit Olam haba through their own mitzvot–or through studying Torah for themselves. After all, if studying Torah is meritorious, it will be so for women as well; the Torah was not given only to men.
However, this kind of attitude is a direct threat to the way of life that MM believes in. The more women who believe that their education is just as important as mens’–the fewer who will willingly stay at home cooking and cleaning or work at jobs that they find unfulfilling so that their men can learn all day.
That is the real point of this argument.If a woman does feel fulfilled by sending her husband off to Kollel to acquire Torah for himself and herself–there is nothing wrong with that. However, more and more women do not feel like that, and there is no reason that they should be led to feel that they do not merit olam haba. I’m pretty sure than most of us would feel that a woman who goes to medical school to work in pediatric oncology or to study treatments for Alzheimer’s Disease sufferers qualifies for a share in Olam Haba, as does a woman who writes a modern commentary to the Torah, such as Nechama Leibowitz whom I mentioned above. However, women who follow these two examples are unlikely to share Mezonos Maven’s opinions, and unlikely to support his seemingly preferred way of life. So he defends that way of life the only way he knows: “It’s in the Gemara”.
(All of this is moot, as I also posted before, as the Mishna is clear that ALL of Am Yisrael has a place in Olam Haba–a point evaded by Mezonos Maven)