The affluent divorce so does the poor. Newlyweds divorce does old-timers. This only means that you and your spouse can only be married for as long as you are willing to keep investing in it. It's a never-ending investment that when properly done yields maximum rewards and leverages.
While minimalist marriage is not a panacea, couples who decide to use its principles have a better shot because it encourages you to prioritize your happiness, health, and wealth over doing what is in vogue or appearing cool outside while you're losing at the home front.