W hat might humanity look like in 400 years’ time if we really do become wiser and more compassionate with each passing decade? The creators of Star Trek: The Next Generation clearly felt the answer closely resembled Patrick Stewart, who has died aged 86 after a short illness . Their decision may well have opened up an entirely new future for Gene Roddenberry’s enduring, resolutely utopian space saga.

Prior to the casting of the classically trained Yorkshireman in 1987, Star Trek was best known for the interplay between William Shatner’s charismatic, impulsive Captain Kirk and Leonard Nimoy’s drily logical Spock.…