Desalination is still expensive. When this article says it's becoming absurdly expensive it's talking about the future. It's not so cheap now.
Besides South Africa there are many countries that come to mind that will/could jump on the bandwagon fast. Spain. South-West US. Morocco.... I'm sure there are plenty more
Yishan, former CEO of reddit seems to be very big on solar powered desalination: https://medium.com/@yishan/our-project-in-hawaii-4c6c5a6052d7
reply