No, its not, because its a cost benefit analysis. The cost to any given family, and more significantly, to the parent who stays at home are HUGE. Loss of financial freedom, loss of job opportunities, risk of being unable to reenter the workforce, loss of identity, often loss of place in society. The costs of BFing are minimal and short lived. The costs of having two parents, well sometimes, there is no other possibility, others remaining in a truly terrible marriage presents its own set of issues for children.
But, bottom line, the costs of SAHM are enormous, unless the person that chooses to do so had no career to speak of in the beginning, few career aspirations for later, and the family can well afford it. Even then, there is no way to know that the benefits of it outweigh the cost -- because there are simply no proven benefits. Unlike BFing and single parenting, there are no studies -- none -- showing that kids with SAHP fare better lonh term. Interesting, huh?
It is interesting, though I don't know if I agree. My mom went back to work when I was 6 - I remember definitely preferring when she was at home and feeling somewhat insecure and gettting into more trouble in the aftercare at my school, so I sometimes wonder what type of intangible benefits there are to having a SAH parent. I mean I ended up doing fine in aftercare and who knows, perhaps the slight insecurity was balanced by my new-found resilience and independence. And incidentally, I WOH and don't plan on changing this.