In a Huffpost piece, Rod Collins takes a deep dive into the question. He both cites examples of companies moving quickly away from hierarchy and argues it has a place when natural consensus isn't possible.
The more compelling question other than how can we protect hierarchies is the question of how self-organizing groups are possible. We already know self-organizing groups far outperform groups commanded and controlled because integrity, initiative and inclusion is intrinsically stronger. Of course it takes a specific approach to capacity building to pull it off with groups populated with people who were educated and enculturated in hierarchies.
People need to learn the "hard skills" of transparency, collaboration, commitment, kindness, presence, working from agreement and questions. As they do, they become aligned, resilient and unstoppable.