It might have something to do with United's "totally unrelated to the MAX" decision to go with Airbus for 50 planes. The fact that United even felt it necessary to explain shows how well Boeing's mitigation efforts have been working, and this fellow was one of the more visible but apparently expendable soldiers leading that effort.
A major criminal indictment is unlikely, for purely national political reasons. Neither party is going to want to have "wiping out America's passenger jet industry" on their resume. It is more likely that the government will buy any planes that 'Boeing can't sell, if that happens. Just look at how many bankers were jailed for fraud after the banking bailout for a roadmap to the future.
United chooses Airbus