Don't worry, once he's dead and can't stop it Hollywood will thoroughly sh*t over this IP as well with prequels, sequels and spinoffs. They're very patient if there's potential for a cash grab.
Then again, Spielberg isn't so pure -- he CGI'd the guns with walkie-talkies in the re-release didn't he? Can't depict our loving government agents as anything but benevolent, right?
Wasn't it Terry Pr⍺tchett who specifically put in his will that all of his unfinished works (on hard drives) were to be crushed with a steamroller?