Not hopeless. Teams with low psychological safety can recover after the toxic people leave. You still need a manager or team lead to show people the path but in

Not hopeless. Teams with low psychological safety can recover after the toxic people leave. You still need a manager or team lead to show people the path but in my experience 90% of the people want to help their coworkers and be part of something valuable/bigger. It's important that the team be highly connected (in how they coordinate their work), if it's one person talking one on one with everyone else then that's not going to result in a high-functioning team. You also need excitement among at least some of the team members.