This is what needs to happen to restore confidence. IMHO.
1. Boeing management needs to develop a culture of accountability and get back its former culture of humility and engineering excellence with engineers at all levels of the organization. The MAX should only be built at Renton for the foreseeable future.
2. Address the issues at Charleston by unionizing and instituting a trust relationship between factory floor and management. Institute a mentoring program between sites to bring workforce skills, behaviours and product excellence up to par with other facilities.
Difficult? Yes. Impossible? No.