He didn't address couples counseling and therapy as factors in keeping marriages going. There's always been marriage counseling; today it's a professional therapist you hire, but in the old days it was your priest/rabbi/minister, or perhaps an elder in your household, who advised you on how to get along.
Today in First World industrial societies, couples just try to wing it, moving out from the parents' house as soon as economically possible, living in a tiny nuclear household, sometimes very far away from the parents, and few humble themselves enough to try counseling.
My wife and I have been getting couples counseling on and off since before we were married, and it's helped a lot in learning how to communicate. Those knock-down, drag out fights are today a distant memory and instead we try to focus on communicating our needs, on expressing our feelings in a non-confrontational manner, etc. I'm all for more couples counseling.
Kids help, too. My amateur theory is that fundamentally speaking a couple is supposed to have kids. It's what we were designed to do. Kids are inconvenient and expensive and people mistakenly feel they'll have a happier life without them, but in a certain sense it's an empty life.
Some people probably should not raise kids, but the majority probably should, but also should learn better communication and then they will have a healthier relationship with both their spouse and their children.
Just my humble opinions :)