Your question is somewhat along the same lines as an earlier question that I did not answer, that is, whether the Canada Pension Plan could do more to offset the insufficient income of women. To my mind, the Canada Pension Plan, like any other plan, really cannot do any more in that respect. The plan already has provisions to that end in terms of the amount of time that women spend raising children.
However, you make a good point: women make a big contribution to the economy by raising children. Instead of using a pension plan to recognize that work, I think it would need to come from the government. Women should be paid for that work, because raising children is the most important job in the country.