Could the Gores portend a trend?

This is an interesting spin on the break-up of Al and Tipper and other long-term marriages that slowly crumble apart.  The idea that people may have less in common and fewer reasons to stay together (kids, financial security) as they grow older isn't very palatable, but it does make sense in light of longer life expectancies. With increasing public acceptance of divorce as a cultural reality, might we be seeing more and more boomers part ways after decades of being happy together?