That article kind of presents an idyllic/outdated view of the Himba people. Modern life affects them as well and a lot of young people don't want to live like that.
Interesting, and indeed a dilemma. I basically mentioned it because just yesterday I saw a guy talking about "sex in the past", and he happened to mention this, apparently in an even more idealized/outdated way.
Basically he said that a bunch of them would go through a "bonding ritual" at the age of 14, and from then on live like a sort of communal marriage, where the woman would shoo out the husband because she had a date with some other guy of the group, and that they were the "happiest people in the world" and would act surprised at outsiders' focus on their sexual practices.
From the other article, it sounded more like forced marriage and women abuse... and here it sounds like most of them want to get out of there.