Larry Niven?
I'm disappointed in that some of Niven's collaborative works got mentioned while a lot of his works from the 70's and 80's did not. Personally I didn't really care for some of his collaborative works...
Niven created an alternative universe which could be made in to both a TV series as well as a series of movies. Protector fits in to Ringworld, Ringworld Engineers, etc...
'A world out of time' also ties in to his earlier works but some of his themes might be too adult for the mainstream audience.
Like others of his era, they use Science Fiction/Fantasy to explore the changes in their current society. (Like the episode of Star Trek where two guys have 1/2 of their face painted Black and the other white... only they are mirror images of themselves trying to question the issue of race... (Stuff like that....) )
So if you have to choose, try and find stories that are:
1) relevant to today's society and social issues.
2) have enough action to satisfy Hollywood.
3) have some bits of drama and comedy intermixed.
I mean there are literally 100's of great stories that could be adapted to tv and movies. Even a safe bet and much better than remaking movies that were done 20-30 years ago and even some of them were remakes of moves from the 20's, 30's and 40's.
I agree that Larry Niven's works would translate well.