Agree with EdgarAllenSnow...money does not equal power in our household. I've earned more money than DH (pre child), the same as DH (post child), reduced my hours to part time (post child) and earned less, gave up work for a while, earned nothing, and now I work part time.
During all this, DH never came the big 'I Am' routine because of the money. We always had a joint account. When I earned more, I didn't see him as inferior and he repayed the compliment.
When I was FT at work, then went to PT it didn't affect my career prospects initially. In fact, a few months after coming back from my ML, I was offered a temporary promotion (permanent ones were banned in the organisation at the time).
I was the one who couldn't cope with it. I was managing a transient team of 8 people, a major organisational change and a new job role and I found myself crushed by it all.
I finally got the team on a more stable footing, made it through the big organisational change, got on top of the role, and found I was bored...so I took a career break (formal name for it, not my fancy dan imagined name for it). And then I quit, as I realised I couldn't go back to the red tape and bureaucracy. Now I'm doing something that actually feels of value, even though the pay is shite. It's also local, school hours and darned convenient!
I think FT to PT can work, but it depends on the employer. I think most women's careers are damaged by pregnancy/childbirth/motherhood. It's not fair, but it's an unavoidable truth. Some people (I won't call them lucky, because it's not luck that makes this happen) have great careers regardless of their family circumstances. But I think the majority of us are held back by maternity leave and part time hours.
Having said that, Part Time has worked o.k. for me in the past and as a parent I would not consider going back full time until my daughter's old enough to look after herself (probably secondary school age). That's just me. I don't feel I can commit to a full time job til that happens.