I don't think anyone here in California cares about the loss of ROTM anyways and it's not comparable anyways. Jaws is the most iconic boat ride in the history of Universal Studios Florida and is one of the original rides in the park. Jaws is the most iconic movie that changed American summer blockbuster movies forever and it still rocks with the animatronic shark rocking the boat and terrorizing the riders. The Mummy in Los Angeles is also practical, but it's a slashed poor-man's version of its Orlando counterparts. I don't think anyone's gonna miss the Hollywood version.
I'm not talking of it's effect on the community. I'm talking about the effect that it will have on Operations.
Until presumably DK in SNW opens (if we receive it), the park would be only down to one coaster. And that it would mark the only park in UPR to not have a sort of thrilling coaster above Hippogriff.
Not to mention, like when Amity/Jaws closed, I would have to assume that the park will take a capacity hit until Pets and/or another attraction opens up.
Mummy's closure is going to bring cans of worms in operational manners regardless on when it bites the dust, for multiple reasons.
Edit: When you also take to consideration that DL has two thrilling coasters, DCA with 1, Knott's with 9 (I may be wrong), Six Flags with 19, and even SWSD when you consider Electric Eel, Manta and JtA, I would think Universal would want to get something to attract that kind of crowd. DK, is something I don't see doing that, regardless of it's innovative ride system.
And as far as UPR goes in that..
USF: Rip Ride Rockit & Mummy
IOA: Hulk and Upcoming Potter family thrill coaster
USJ: Hollywood Dream & The Flying Dinosaur
USS: Battlestar Galactica (Two coaster types in one), Mummy
Beijing seems to be something that I can't pinpoint on however.