To be as brief as possible, Universal passed up (what I see as) opportunities to add this sort of ride at USF (a park that would benefit from a more diversified attractions lineup) with the Shrek replacement and DreamWorks, and there's no classic-style dark ride coming to Epic Universe, either. The dark rides that will be there are either thrill rides (Monsters, Ministry) or heavily interactive (Mario Kart).
DISCLAIMER: Mario Kart is pretty good and I expect Monsters and Ministry will be, too. But the relatively passive, non-interactive experience like SLOP seems decidedly out of fashion (in Orlando, anyway).