All I know is this:
It IS possibe to have mom and dad work successful jobs, IF their scheduling is right.
My mother is a teacher, my father works for the state government. My mother was always home at my lunch hour, after school, and all summer. This was important.
My parents always included my brother and I in everything they did. None of this "us two are going away on vacation" stuff. We were always together, allowed us to have a lot more parents time. We also went out to eat a lot on the weekends. Not to anyplace expensive, usually to an early bird special at a restaurant, or the lunch special at the local Chinese sit-down restaurant. Why? Not necause it was the simplest path (though my father did want my mother to not have to do dishes, etc), but because we were usually out doing stuff. We would go along with our parents to go shopping to learn how o be better consumers, nd that sort of thing. Eating out made it easier for my mother, and gave us an extra hour of family time that was IMO very important.
My mother made time to cook, keep our two homes clean, do the shopping, laundry, etc. My father did the mechanical work, lawn, cars, etc. They helped each other out as necessary, but kept out of one anoter's hair when doing their respective jobs.
So, I think that he two of you can have careers, kids, etc., and be financially sound, but likely your wife will have to give up the 6 day a week/OT based job, once kids start coming around. I dont think a stay-at-home mom is necesssary after a child is 1.5-2, but having a mother that is there during the off-hours is crucial. The ability of the mother to be there for the kids helps reduce some of the problems hat kids encounter when theyre endlessly shuttled from day care to day care, but at the same time, both parents working allows the family to be comfortable financially (plus of course sacrifice and not always trying to keep up with the Joneses and incurring lots of debt), so there arent money woes.
Ive lived through it appening successfully, and am now getting ready to do the same thing in my life (Im in my mid-20s, so my next big steps will be coming up in the next few years).
Good luck!
JMH