Whereas WDW has a big problem with not adequately investing in new rides in each of its parks, Universal has a slight problem with building the same kind of ride over and over. Each of Universal's last major E-tickets have offered - essentially - the same kind of dark ride/simulator hybrid experience; they're all a lot of fun (and I'm sure Gringotts will be, as well), but they do feel very similar, even if the ride systems are different. It would be nice if Universal could find an IP that they could use for another classic, grand-scale, all-ages dark ride; either park would benefit from one.
Don't forget, there is another screen based ride going into JP at IOA. After Twister, T2-3D and Fear Factor are gone, you will probably see at least one or two more.
Think about it... Disney loves people movers and spinners, USF loves 3D dark rides. Avatar will have at least one screen based ride similar to Soarin', and if Star Wars ever gets built, it will probably have one too.
Cars Land basically got a Test Track based ride, a spinner and body lean controlled bumper cars.
You will probably be rescued by Hermoine with an "Arresto Momentum" right before hitting the "ground" and land on a new part of the bank vault track.
It would be similar to the coaster you mentioned, but it will play into a major part of the back story.