Whether it ends or not might not be as important as whether it will be fruitful, invigorating and evolutionary. Those things may or may not have importance to everyone. To some, longevity is more important. People place alot of importance on longevity, just to make it 20 or 30 years through marriage is some virtuous thing, no matter the boredom, misery or stagnation. They have devised “techniques” to put aside their resentment. Just in order to make it through to another day.
It is common to use the word “fail” to refer to a marriage that is ended. This supposes that a marriage is supposed to last indefinitely, through all time, no matter what it has transformed into. And yet, I have seen success, as opposed to failure, in the termination of a bored and stifling marriage. I have seen it improve lives. The marriage was a success, because it taught valuable lessons, even if the final lesson was to end it.
And so to answer your question, I have seen many marriages last years and years with the basis being financial, or otherwise material. It can last until death, and quite often does. Preservation techniques can be employed to keep it alive. Humans are very good at adapting to things that slowly kill them. Cigarettes and alcohol only make one cough and gag at first. They can be overcome, and the destruction can continue. Same goes for destructive relationships.