I also remember two other stories. One was from PP forum, and the other was an acquaintance of my W and her real friends.
1) From PP - A guy wrote in that his W had an MLC and married the OM. 4-5 years later, she was at a wedding reception with OM, and she texted her original H about how much she hated her life, her new H was abusive, etc. and that she missed him. He had already moved on and was engaged to someone else. He didn't even respond...Karma is a B#*#$.
2) I completely forgot about this, mainly because I only heard about the tail end of it. But a mutual acquaintance of my W and her best friend (at the time - probably her real BFF) had an MLC, left her H, and pretty much slept with anything that resembled a man. A few years later, she tried to get him back, but he refused. Too much damage had been done.
So in summary, yes, I do believe most will try to come back...but it is up to us in the end. This is a lot of pain, financial destruction, etc. to get over. As much as it hurts now and how much we would give anything to have them back...eventually resentment, etc. sets in.