Meanwhile at the Studios, we have 5 3D attractions - and counting! 7 across the resort (with Kong) just seems too high.
Expensive to maintain? Who gives a crap? That's the company's problem, not yours. I'm so sick of excusing corporate decision making because it makes monetary sense for them - demand more, not less, don't justify their cost cutting measures by being over reliant on screens. Bad AAs will never be impressive, but good AAs have proven to stand the test of time - see The Wicked Witch, Benjamin Franklin and Mark Twain, SIR/Sarge, T-Rex, etc... Nothing will ever compare to a physical, tangible creature in front of you, no matter how great the 3D is or how well it's hidden in the set.
Someone recently made a great comparison between Universal's screen obsession and the CGI craziness of the late 90s, early 2000s. Suddenly we had the technology to literally make anything happen on the screen via CGI, just as we can now create virtually any environment with any special effect if we envelop you with 3D screens. But just because you can, doesn't mean you should... the mind and the rider gets a whole lot more out of a complicated series of effects executed in different ways (this is why Jurassic Park still holds up, SFX-wise, today, ditto with Haunted Mansion in the attraction medium) than a bunch of "crazy things" happening clearly under the guise of a 3D screen.
Again, I believe Spider-Man represents the peak of the format. Gringotts may prove to be the exception given its crazy new ride system - but even then, I think the praise should be lavished on the system, not the show elements, as have some here and elsewhere have lamented (though we will see).
Universal needs to be reminded to exercise restraint when designing its attractions. Just because you can show a full-on battle of Kong fighting three enormous dinosaurs in front of you in 4K 3D, doesn't mean you should. The mind numbs to that after a while and it ceases to be exciting, the mind no longer engaged in a disbelief of "how did they do that!?" You're just watching a movie with some motion to match. Sometimes a ride through a fully-realized jungle, with some brief animatronic encounters with a live T-Rex before encountering Kong in the aftermath of the fight, will be far more effective... the power of suggestion shouldn't be forgotten.