Ok I'll play, here are my suggestions:
The Black Hole - this could be great with some good creative people behind it, the framework story works they just need to keep it from being silly
Devil's Rain - I imagined a Josh Brolin as a sheriff out west in a sort of No Country for old men with devil worshippers
Logan's Run - I LOVE this movie but it is dated and a new version could be a lot of fun with a good budget behind it
Silent Running - again so topical for now with its environmental message , this is ripe for remake potential and dear god please no Joan Baez songs on the soundtrack