I want to make this really brief, because I know a lot of the traditionalists won't like me posting this but here it goes:
A lot of long term marriages didn't stay together because of the kids/love but because of money too. For example, if the husband and wife have a mortgage together, divorcing could have a lot of consequences. If they divorced and neither one can make the payments by themselves, then it would either be lose or sell the house. So even if they have a bad relationship, many couples will stay married because they don't want to lose all their money, or have to pay off leftover debt.
Another few more consequences would be that many places won't hire you without having a good credit score, and you might not be allowed to rent apartments either. So by defaulting on a loan or going bankrupt, your credit score will be shot. So many people stay married not just because of the kids, but but to protect themselves and their own finances.
I haven't read a marriage/traditional family mytake on here that does mention money. At all. Everyone really avoids that point. They try and pretend it's all emotional, or that married couples are automatically more mature and better than single parents or divorced couples. But from my pov that's just living in a fantasy world. Money does matter, and it matters quite a lot whether people will admit it or not.