Ok, for all the sugar-coating and tap-dancing around the facts, the absolute truth is that most of these marriages will not be saved.
I've wondered about this, too. But, then again, I know of 3 people who's marriages did work out and they do not update. The biggest updaters seem to be the ones struggling.
But in the end, if a person saves their marriage, does it matter how many doesn't? Also, don't the reasons matter? Many people on these blogs are dealing with adultery...that used to be a criminal offense. Others are dealing with drugs, addictions, and other things.
Success can be a year of struggle that doesn't work out, too. Being able to walk away knowing that you really, really tried. That you became a better person. A better future husband or wife for someone else.
Success isn't attacking the X or the WAH/WAW. Friends do that just fine. Success is in the effort.