No more "Mr. Mom"

From the Wall Street Journal, a recent article about the “masculine-ization” of parenting.

More and more fathers (in the U.S., at least) are staying at home and raising their children -- and they tend to have a different parenting style than moms.

Stay-at-home dads still feel some sense of isolation, but less of a sense of stigma than they might have in the past.  What do you think are some marketing implications of this trend?