From what I've noticed...

Every Sci-Fi show/movie that I've seen is also influenced by another genre.

Star Trek -Westerns
Cowboy Bebop - Film Noirs
Firefly -Westerns
Star Wars - Kurisawa samurai movies/ the Samurai genre

except for 2001: Space Odyssey, that's just artsy and on it's own. Something that I love because no matter who you are you will take something away from that movie. I'm not saying that every part of that movie is amazing but because of the different plots there is a story for everyone. The most popular one is with Hal 9000, which is genius. Such a cool story. Anyway.

So, if I was to make a sci-fi movie, I think it would have to be meshed with another genre and I am thinking Middle Ages.
Everything is just starting out, planets are just starting to be colonized but all of the communication has been destroyed between the new colonies and now it's a lord of the flies situation. Or maybe there was a crash, or maybe settlers starting a new colony. I'm just saying I think this idea could grow into something with a touch of brilliance.