That paper also reflects the consensus of all the other resources I've been able to find in that the rate of divorce seems to be declining since the 70s; it may be too early to be overwhelmingly certain, but the evidence suggests that not only are the odds better for a marriage in the 1980s than the 1970s, but that the odds are better still in the 1990s, and then better than that in the 2000s.
Could you point to the comparison of the 2000s to the 1990s? As to the 90s vs the 80s, the difference is trivial.
Dalrock writes an interesting article related to Dr. Helen Smith's book the Marriage Strike. I really have to bump it up on my too rapidly growing reading list. (^_^)