I just looked through a list of publishers (including elders, etc.) for our congregation and, exluding minors, here's how it shakes out for us:
Observably stable marriage: 31%
Separated/Divorced (at least once but not necessarily at present time): 21.7%
Not separated or divorced but with HUGE problems in the marriage: 33.3%
Single: 14%
Knowing some of the couples in the "huge problems" category, separation or divorce would lead to a much higher quality of life for all involved.