I don't think they should just take any old concept and slap a Doctor Who label on it.
That's how
Torchwood started. It was a spec script that RTD had in his drawer ("Excalibur"), and he reworked it as a
Doctor Who concept.
That's what
Doctor Who does, week after week. It's an anthology series, albeit one with continuing characters. It takes a story format or concept and drops the Doctor into it.
That's a game a friend of mine and I used to play. Take a book or movie, and drop the Doctor into it. (Or, for a variant, take a character from film or literature and make that character a companion.)
Event Horizon would work tremendously well.
Planet of the Apes.
One story I have never been able to figure out what the Doctor would do within it is
The Great Gatsby. (It does, however, work amazingly as a Wolverine story -- Jay Gatz is actually Jamie Howlett.) I mean, the Doctor could turn up at one of Gatsby's massive parties, but there's nothing the Doctor could materially
do within the story.
The High Crusade is one of those things that I looked at and said, "Yeah, I can see how this works in a
Doctor Who setting." You probably wouldn't take the story wholesale (especially not the part about the knights converting all of space to Catholicism), but the core concept would work pretty well, and you might get six or thirteen episodes out of it.
It's never going to happen, I know.
