Monkeytrousers, I think that women choosing to be primary carers and their economic dependence on men is absolutely the same issue. Work in the home, carried out by women, has historically been undervalued, or not valued at all.
There is a huge issue of gender power relations here. The fact that women are prepared to take on caring, unpaid roles, which leave them financially vulnerable, is greatly to their credit in some ways. But is hard to imagine men choosing to take on such a role in large numbers. Because, by and large, we live in a world where men have more power than women.
It is often (but not always) true that a crap relationship is a crap relationship for both parties - and this is a good example of how skewed gender relations are bad for men as well as women.
Neenstwins, I think the first year or so after birth is a different case, especially because of breastfeeding and recovery from pregnancy and labour. But I don't think there is any reason why men and women can't share the primary carer role after this.
It's also certainly not true that every mum I know that dreaded going back to work - some were ready to. And many women might feel happier going back to work if their child was, at least some of the time, with their dad.
I'm not saying that all women should go back to work FT - far from it. But I would like to see a situation where it was more common and acceptable for both men and women to work PT.
The only thing I really do disagree with you about is the fact that women are happy about the fact they earn less. They may accept it as a necessary pay off of spending more time with their kids, but I don't think they are necessarily happy about it, particularly in the case of family breakdown. So many women are screwed financially by divorce, and end up living in poverty in old age. Unfortunately, with the divorce rate as high as it is, this has got to be a major concern.