I kinda hope it's like a movie about the literal origin of Star Trek as a television show. At this point, I feel like that would have a better chance of actually getting made then anything set in universe.
This is an idea I ran by a fellow Trekkie awhile ago. An "Ed Wood" like movie about the behind the scenes of TOS. Satirize it from a place of love, focus on the drama between the cast and the antagonism between the studio and Gene. Quality movie material!
Have you seen Shadow of the Vampire? It's a fiction about the filming of Nosferatu (1922) where they actually used a real vampire as the main character