“It was true, Young had offered to make one final Bond film, but it would have to be the last film in the series.  Young felt that only with the knowledge that James Bond would not return could there be any further character growth.  He pictured an aging Connery finishing his final mission.  A Bond knowing that his life as a secret agent was over, sadly turning the keys of the Aston Martin over to a heartbroken Q, then walking silently out the door, leaving the ghosts of his adventures to haunt the faceless gray building off Regent´s Park.”

Terence Young: James Bond’s Creator?.