I would suspect the numbers show we're closer to the 1950's than you think. But I'm happy to be proven wrong.

Even if it is only 5% stay at home fathers, that is still 5% that is ignored. Staying at home as a parent isn't the right choice for everyone, but when society assumes that it is only mothers that is a disservice to the fathers who want to (and in some cases the couples who want a parent staying at home but it never occurs to them that it could be dad)