My personal observation is that if the parents love the kid more than they dislike themselves, they are going to stay, at least until the kids become adults.
If you want your kid to have successful relationships when they grow up, FFS don't let your kid grow up in an unsuccessful one.
Good call.
If kids are exposed to frequent arguments, spirals of primitive abuse, hatred, emotional coldness etc. they won't end up faring well in adulthood, and all the efforts of parents trying to stay together for them are pointless.
But yeah its a shitty situation where everybody loses.
I would replace "dislike" with "incompatible" though.
You can be very attracted physicslly to someone who is your intellectual and economic equal, to then not be able to hold it together because that person's personal traits ans preferences are so far off one's own. It goes beyond "he liked to watch tv instead of going out to eat w me"
That being said, your observation should be a heuristic, and it should be repeated more often.