Firstly I dont think that divorce statistics can be applied to MLC and how long the relationship with the OP will last. This is not a comparison that can be clearly made.
The characteristics of a MLC are fairly clear and follow a script we see described many times on this forum.
Normally I believe someone in MLC either meets another person in MLC OR meets a Narcissitic character who sees their weekness and wants to control or 'save' them. The alienator can indeed be after finance and seek to control for this purpose. The MLC may see the OP as a person who needs to be 'saved' by them. They form a symbiotic relationship and they feel wonderful and have no guilt (in early stages). They don't see the hurt they give to their spouse and children. They explain it away as it is too hard to face.
This does not last forever however, but it does last through the stages of MLC. BUT eventually one of the two people will start to see that this situation is not sustainable. They see the damage and they should then be past the half way stage.
A Narcissist becoming more comfortable in the relationship will then become more controlling and exploit the weak one more, not 'saving' at all.
In RCR's article on Alienators she clearly explains this and says that the Alienator will strangle the love out of the relationship. Particularly if your spouse was in a long term marriage before this happened, they (the MLC) can then start to make a comparison between what they had and what they now have. However this can take some time, maybe a few years, because they can maintain the play acting and symbiosis for a long time (if they don't live together). The closer they are may shorten the time? Also they will work together and everyone else becomes the enemy, until the enemy becomes from within their relationship.
The problem then becomes when the MLC starts with liminality and starts to see the damage caused to friends and family. They could quite believe that as the LBS may not be receptive to reconcilliation, that they are stuck and cannot repair the enormous damage and become very unhappy. They may feel completely lost and in despair.
Maybe at this point the alienator cannot fix or 'save' the MLC any more and they become the enemy?
But the LBS should not be too receptive immediately to reconcilliation or we head for a sorry future of being dominated by bad behaviour from the MLC. If we consider reconcilliation then rules have to be firmly applied. But a closed door may be accepted by the MLC and they may not ask again. They will be very vulnerable at this time if they can summon the courage.
In reality reconcilliation WILL be difficult for the couple , but repairing damage may not be so difficult if the LBS has been calm and followed advice on this forum. Remember an LBS is often much stronger than an MLC if they are standing.
The worst thing through all this is to confront the alienator, this gives them power and creates the atmosphere of LBS being the enemy and enhances their symbiosis.
The best way for a LBS to deal with an alienator is to recognise that they are a symptom only and not the illness. Ignore them completely, this takes away their power and we LBS must accept that this illness needs to have the temperature taken out of it by reducing the heat.
This is why we have to somehow get our composure, retain our sanity and think carefully so we don't react in anger to things that happen and things that are said. We LBS head for self improvement for ourselves and to prepare for our next stage with or without.
There are no statistics for MLC, they follow various scripts but dont follow a fixed route down this tunnel.
This is only what I have read and learnt over the past two years of what seems to be at least 4 years of my wife's MLC and the alienator is still there, but my wife now sees the damage. Now the fun begins.
Life is good, once you understand.
We make our own happiness and everyone likes to be with happy people.
One man's junk is another's treasure and life goes on. Make yourself into a happy treasure. :-)