If you'd have asked me this question 2.5 years ago, I would have said yes, because I was in the process of leaving my then DP.
Even though we weren't married, it still took me about a year to leave once I'd made the decision, due to how much our lives were intertwined after 6 years together (at that tie).
We had two DC, plus he had a NR DC, a mortgaged house, shared car with loan attached, a joint account and joint bills. I was financially independent, and earned a large salary more than double my EXDP's so I could have left at any time, but it took careful planning to do so.
The whole process of unravelling our lives together was so exhausting that personally I think things have to have got really awful in the relationship before a number of women will leave, especially if they have DC. With me I knew it was the end of the relationship it was when my ex started being emotionally abusive towards me in front of my then 3 and 4 year old DC.
If life is just about bearable in a relationship which isn't really working, I suspect a lot of women just put up with it, in the same way a lot of men stay in ok relationships until they've found someone they feel is better for them to pair up with.