It wouldn't surprise me if those who marry, especially young, have a more traditional view of gender roles, and therefore married couples are more likely to have a husband/earner, wife/homemaker relationship. The news story is sparse on the details - it's almost impossible to control for political viewpoint, religious viewpoint, age of marriage, as well as earnings which apparently they did take into account. While these sorts of surveys can be vaguely interesting, I think you simply need to take your own relationships on an individual basis, see how the other person is going to act.
I do more housework than my wife, but then she earns a lot more than I do. It works for us, but I'd bet that this survey would tell you relationships like ours barely exist. It's all down to the individuals.
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"You're never more alone than when you're alone in a crowd"
-Captain Sheridan, Babylon 5
Music of the Moment: Radiohead - In Rainbows