Are women responsible for the evolution of culture and language?

I just became aware of this theory, though it has been around for awhile. See, for example, here The anthropologist Sarah Hrdy did a lot of work in this area. Here is an excerpt from a book of hers where she talks about the impact of shared child raising.

Quick summary for those who don’t have time to read the articles:
By having young female friends and relatives share with child rearing, women were able to do their work of plant gathering. The social interactions involved, both between the women and their helpers and between the women and the children, favored those who were skilled in social interactions and led eventually to the development of speech. The hunting skills of men did not require the same level of communication.

Have you heard about this theory? What are your thoughts?