My experience:
-I got a proposal to change company and country.
-I married to take my wife with me.
-My wife had a good job that left to come with me but she always said that once we establish ourselves, she would look for occupation;
-Once we arrived to our new country, she discovered that all the women of my expatriate collegues were at home, either raising the kids or just enjoying life;
-Then she started to be involved in this and she actually enjoyed it;
-We spoke about having kids;
-I spoke about her getting a job. Not because actually we need it, but realizing that one day things will change and it is quite difficult to get a job after some years out of the market (no networking, no experience, etc.);
-She was not very convinced about my reasons;
-We agreed that if she could not get pregnant until January she would start to look for a job (oh yeah and we enjoyed a lot trying not to get her a job

-She didn't get pregant, and started to look;
-In March she found a very good job (excellent pay and good experience);
-In April she got pregnant (nothing like a little stress to spice up);
-She started to speak about leaving her job because when you see that little thing in your arms and think that you will left her with some strange, your heart starts to break;
-I manage to convince her to stay and see how the things develop;
-We had the luck to get an excellent babysitter (but we had to try 2 before the actual one);
-So now we both work and during the day our little baby (8 months old) stays with the babysitter.
As you see, for my experience (and long post) ideas change along the time, so what I would suggest is that you both maintain your jobs, and see where the flow goes.
Regarding the question, my wife would need to earn a LOT more than me for me to accept to stay at home, not because I don't like to stay at home but because how things (real world) are.