I don't find Star Trek believable at all, starting with the 'Warp Drive'. As soon as you add a device like that to a plot it becomes impossible to see it as a possible future.
The Warp Drive is just a plot device, so that the humans can interact species from other, distant worlds.
Roddenberry surely intended it to be. It was the show he'd wanted to make all along, or a great deal closer to it than the original, in any case; since his death and especially since the show wrapped, many early screenwriters have described, in various fora, the extent to which he'd try to enforce the logical consequences of his political philosophy, such as the disappearance of workplace interpersonal conflict, a libertine attitude toward sexual activity, and such enduring peace both internal and external as to render unnecessary the maintenance of a military organization. After Roddenberry's ill health made it impossible for him to exert creative control, and especially after his death in 1991, TNG-era Trek evolved toward a more plausible portayal of its characters and societies.
Not terribly far fetched, just need more pylons.
And SG1 had that horrible starship spinoff