Your going wayyyy to into this maze treatment.
You have know way of knowing that its a film that hasn't come out yet. Thats just your personal guess. If Murdy was going to do The Mummy it would be his own version of it. The maze wouldn't be based on a movie. Most likely.
Hmmm let me think, Lemonade. Oh wait, Cabin Fever those kids tried to serve kids lemonade to cops while they're at the crime scene. Cabin Fever seems very realistic because you know who created it, Eli Roth. Somebody I'm sure Murdy would love to team up again with.
Also, to the people thinking Stranger Things, I've done a personal treatment. Everything would work perfectly. The only part that is really difficult is the facade. How would you make a facade for Stranger Things. Then it hit me, the facade would be the entrance to the upside down.