Not all engagement is created equal. Engagement for engagement's sake promotes addiction because addiction is a coping mechanism to other problems. Without explicitly targeting those problems at a societal level (which includes organizations), they'll remain unchecked and allowed to grow. More specifically, based on my research & recovery experiences, addiction's a learning disorder resulting from things that can be overcome (in part) through emotionally supportive social connections, paying attention to one's needs (which requires being able to pay attention to oneself, courage to face one's own issues, knowing what one's basic humans needs are, learning how to meet those needs alone, and how to meet them with the help of other people), and developing skills for emotional regulation. Any design theory seeking to minimize its contribution to addiction will need to promote human connection (which is based on the quality of interactions and not simply having the ability to interact), respect attention, promote mindfulness, and responsibly use human emotions as inputs.

As for unsustainable configurations, they're inevitable. With the advent of global connectivity & new research, humanity is now primed to take more responsibility for its unsustainable configs & devise strategies for intentional corrections, as opposed to passively waiting for inevitable self-corrections.

Through solving addiction (or any other unsustainable config), the law of unintended consequences will be invoked at some point and a new unsustainability will emerge because no system is perfect. All we can do is accept this fact and do our best to address things as they come.