Romance Fiction - Can this marriage be saved?

As I finish each new romance I read, and I read a book every two days, one question pops into my head. Can this marriage be saved? Sometimes I don't think the romance I've read is one where the couple will remain as a couple for long.I've been guilty of this in some of my romances and wondered what the problem was. I've come to several ideas and I'm sure those who write romances can think of others.

The first thing is that the writer becomes so involved in the plot which usually involves the outer conflicts that the romance is while not neglected, is not completely developed. I;m a plot person and love weaving all the lines and sometimes must pull myself back and ask "What's happening to the romance part of the story?

Another thing that makes me wonder if the relationship will last beyond the words "The End" comes from another problem. Often the writer is so intent on what keeps the characters apart of in looking at the conflicts, why these two characters are going to stay together is forgotten. What common interests do they have. In revising one of my current projects, I was surprised to see the number of common interests the couple has. Not all are major but often in real life it's the small things that drive people apart. My couple share a love of cooking, the same tastes in reading, movies and music.

So, what are your thoughts on the matter? Does every romance that ends in happily ever after stand a chance of lasting well beyond the end of the book? Even if the epilogue says they do.