Where is your source for the claims that the Star Trek series were all shot on film? And even if that were true, analog film has no digital resolution, so you're wrong, either way. Films will look better on bluray because you can see the film grain with more detail, but not TV series shot on tape.
Star Trek, shot on film, edited and completed on film.
*The Next Generation, shot on film, edited and completed on video tape.
Deep Space Nine, shot on film, edited and completed on video tape.
Voyager, shot on film, edited and completed on video tape.
Enterprise, some shot on film, some shot with HD cameras.
*CBS went back to the original film negatives and completed the show at 1080p. Trekcore.com has extensive material concerning this project.
But even something shot on 1080p digital will look better than anything shot on film.
Google is your friend. There are tons of resources out there that explains why you are wrong.