Hm. Maybe do what used to be the common way with music: strip the rights to the product from the original creators who turned out to be monsters, and let others to use them to make their own versions. Lots of old popular songs were done and redone a lot of times before some version became the established one that we now remember. Nobody seems to really know who originally created the music for the song we now know as "Yankee Doodle Dandy", for example, and the lyrics changed several times before the now known version was written down.

So: let some other film makers, like let's say Angel studios, or anybody who wants to do it, make new versions of the Star Wars movies, with different actors, and then continue the story with their fully own films. Let writers take Stephen King's stories and use whatever bits they want of them, perhaps somebody could rewrite something like IT where the kids who defeat the monster finally do it with the help of the towns church's pastor. Take Jagger's music and let others do as many covers with somewhat different versions or rewrite the words to their own liking.

That way we could keep what was good but remove it and its connection to the original makers, maybe permanently.