I would like to see Nnedi Okorafor’s “Binti” trilogy as films. Each of the first three stories is novella-length.
The BBC (I think) did a dramatization of John Christopher's Tripods Trilogy. But I always thought his Prince Trilogy was the better piece of work and would make a fantastic high-budget series. Dark, dystopian and a thoroughly ripping yarn.
This is a good question. Johnny Mnemonic came out of a short story, and it's definitive.
Sing a Song of Lost Valdese by Karl Edward Wagner