If Universal Orlando were owned by Merlin Entertainment and was in the UK, it would be far more likely. The British theme parks love their "scary" rides for some reason (See Hex, Walking Dead: The Ride, Thirteen, and Darren Brown's Ghost Train).
But I've always wanted to see a theme park haunt or even some scream park do a simple bus bar dark ride but exclusively for haunt season with scareactors and gory effects. Also unlikely, but would be really cool!