Don’t be consused - A & B are not interested in single pilot airplane. What they doing now is in essence building a pilotless aircraft which for transition/interim period of about 10 years will be MONITORED by pilot, who not will be called “system panel operator” just to avoid upsetting the unions. It also answers your question regarding the training - no more Captains and expensive process of gathering experience. There will be more and less experienced pilots monitoring the systems, max paygrade shall be around current year-5 FO. And then in 10 years after that finally we go into into a fully pilotless aircraft with elements of ground based monitoring functions.