A lack of vision and a figurehead is a problem true, but on the other hand these are two very old shows - back in 1966 Gene Roddenberry would never have imagined that his creation could go beyond a few season, as any other programme, and grow to become the worldwide phenomenon is has here in 2020. Star Trek was an ensemble series with an inherant shelf-life, roughly eight main cast, and eventually no matter whether it ran three seasons of eight it would run its course and those cast would move on. So to have Star Trek still rolling along in 2020 is really incredible on that basis. And yet it still has that inbuilt limitation, of needing a cast of eight and a Starship, preferably called the Enterprise, and how long can you keep that format without it getting stale, as it has, and needing a rest?
Doctor Who is similar. Back in 1963 it was only intended as running a few weeks initially, and that went on to a reprieve of months, which somehow turned into years, and then decades! Like Star Trek it faced a hostile television environment and either apathy or outright contempt from studio executives, but even when those executive finally managed to 'assassinate' the show it came back. Star Trek and Doctor Who, they both became survivors, and in a sense immortal....
But they do both need to be looked after, safeguarded. And that isn't really happening anymore. With Doctor Who a major factor is the sheer weight of interested parties who want some form of representation, or the various diversity quota's and social commentary that the BBC itself now insist on being included. And the chances of any writer being able to deliver a good strong story with all of that to cater for first and foremost is slim indeed.
If you were to take some of you personal favorite stories from the original series and put them up for a remake in the modern era, under Chris Chibnall and Jodie Whittaker, those stories would bear only a superficial resemblance to what they were originally. Once readjusted to cater for the BBCs diversity quota's, subplots introduced to cater for character soap content, a social commentary or two, a flapping hyper-ventilating Jodie Whittaker, those stories stand only a small chance of being anything but marginally diverting...
What might seperate 'The Ark In Space' from coming out like The Tsuranga Conundrum? 'Frontios' from resembling Orphan 55? 'The Masque of Mandragora' from the fate of the Witches episode....?
Think both shows did best when they remembered the formula, as they were to seek out new life and new worlds, and to be entertainment, not meant to be agenda based platforms!Star trek did address issues like white abd black racism, but did it creative way, as in Kirk and Uhera kiss, or by having black/white beings chasing each other until all others had destroyed themselves.
Un this current PC climate, both series gave become pretty much PC driven agenda shows!