I agree that it would be okey for them to stay together and decided not to have children or even adopt one instead.
But I doubt that is an option, since I have learnt from people living in Africa and also users on this forum that having children is an important part of the family culture there and not getting married and not procreating can lead to being socially rejected or stuff like that. In my opinion it is non-sense, since I am from the Americas; but I get how different cultures can be around the world.
I have learnt more about African culture since I joined this forum, tbh.
It is nice to know that you have learnt more about African culture and it is also good that you know that the culture is mutating and going through alculturation which is affecting the social, economic or psychological state of a typical African society. I have to let you know that things like polygamy are giving way to monogamy giving rise to adoption of children where couples in nuclear homes are not able to procreate for one health reason or the other - this was not heard before. I guess your country (America) and other European countries have influenced African society a great deal to the extent you may not be able to trace a pure breed of African culture lately and this is the effect of brain drain going on in Africa. Unlike 30 years ago, abortion, adoption of children, monogamy and nuclear homes etc were not African practice but things have changed because of alculturation, a product of technological developments. The African culture is not what it was before now and if you want to learn more you can read Things Fall Apart by Chinua Achebe .