The last thing I'd want to go in Mummy's place would be Diagon Alley, and that's simply because I believe USH especially, should remain a diverse park. Something I loved about E.T., was how it was purposefully themed to a soundstage on the outside, because you were stepping onto the set of a movie directed by Spielberg. This is the approach that I feel USH should've taken when designing some of their future attractions, and I liked what they did with JP, saying it was their Hollywood park to fit around the theming at the time. This is why I also wouldn't want to see a full JW, hyper immersive section of the park come to USH, because it would kill Mummy, and through that kill additional attraction diversity lineup throughout the park. The best replacement for Mummy IMHO would be some sort of Universal Monsters attraction, which last I checked, was one of the proposals mentioned here on this forum, along with a JW gyrosphere dark ride. In conclusion, as much as I love JW and JP, I wouldn't want to see anything more come to the park aside from the River Adventure already being there. Like I said, I wish they'd take more of an approach that E.T. took way back in the day, and I worry that USH is slowly straying away from its roots, which is the last thing I want. It is a studio themed park, and it seems that competition with Disney has thrown them into a pattern of taking notes from Disney. Hyper immersive lands and attractions should remain at Disney. Universal should really harken back to the "ride the movies" days. It is what made them so unique in the first place... I hope whatever eventually replaces Mummy is different. I want them to give us something we never knew we wanted in the first place.