Re. men and working part-time, I think there are men who want/would like to do this. The problem is that they are/would be affected by the same problems that women are when they step back from their careers and work part time or stop working altogether for a while.
That is that very few career jobs allow you to work part-time. If you take time off and then try to go back, your career is likely to have passed you by. If you take a step down and take a more humble, less skilled part-time job for a while, it is unlikely you will ever be able to go back to your full-time career in the same way, etc., etc..
Add to that, it is not seen as macho to work part-time. Even the most enlightened, emancipated, new-agey man is likely to suffer some loss of self-esteem or confidence that he is no longer seen as an 'Alpha Male'. If we consider how much women suffer in terms of feelings of loss of identity when they give up their career to look after their children (witness this thread), then I suspect it must be even worse for men, for the reasons above and also because it is still more unusual so they will be in a tiny minority and probably feel very isolated.
Most families do require at least one parent to work full-time for financial reasons. It is not surprising that this is still usually the man.
How is this ever going to change? We can only keep lobbying for more flexible working practives, job-shares, etc.. Our value in terms of what we do is usually measured by how skilled our work is and by how much we are paid. Motherhood is not valued because it is not seen as 'skilled', it is certainly not rare and you don't get paid for it. It is only when the population starts falling, that some countries introduce incentives for having larger families.
Anyway, waffle, waffle....
I am just jealous of women whose husbands willingly do their share of the housework and who don't come home and say: 'this place is a tip, what have you been doing all day?' A little appreciation goes a long way towards soothing the pain of drudgery and loss of identity.