I think having more than 2 in each flight deck where the third person does the monitor work of the flight
where he/ she can maintain the logic flow of operation during the flight .
As the team of three improves the safety of the logical decision during flight .
Try and sell that idea to the airlines with the high cost of employing another person.
any of the senior crew team can do the monitoring of the logical flight flow up procedure .
In recent accidents both pilots were pre occupied by parameters that either took their attention or remapped their thinking .
let one hand can never clap " not implying any thing " until final results show up . Just of the assurance point of view is extra safe !!