I'm not sure of your situation now, but i can tell you as a new mom of a 6 month old, I absolutly loved having my husband stay home. I had several fears about the whole "bad mom" thing, and i can tell you that when trying to recover from a C-Section and look for a new job, was terriable, and stressful.
My husband handles things a lot more logically then I do, he is also a lot more calmer than I am. When my maternity leave was over I was ready for my space! Not to say I did not love my son, but motherhood at that point was just not what i was expecting.
Our son is a very happy baby, and I can honestly say that it is mostly due to my husband. He is always goofing off with him and playing new games. Not to say I am not involved in my sons life, but at this stage I feel better at work then I do as a mom, and i think its because I know what I am doing, and can plan more...with a kid you cant plan to much lol.
Look I think it is great that you want to be a Mr. Mom, all I can tell you is that for our situation it was our best decision ever! I eventually got over the guilt and really started to bond with my son, i found that having my job kept me sane, when i was upset over not sleeping or having to juggle work and a kid, there would be my husband taking it in like it was nothing. I think guys are more equipt to handle a kid in the beginning because they dont have raging hormones or depression or as much stress as women not only put on themselves but deal with on a day to day basis. I wish you luck and hope that she see's that this could be the best thing for you and your family.