Honestly, not sure if I'm in the minority here, but unless it's like a Big Thunder Mountain level of intensity coaster I'm against adding more coasters to the existing parks.
I'd love to see a dark ride or something else a la Reign of Kong to be added to JP. Though I fear the Dark Ride could end up becoming "Dinosaur (Universal Edition)" if they weren't careful with how they handled it.
If your taking out a roller coaster it should be replaced... With another coaster. Universal shouldn't forget their roots, which includes having a variety of attractions. This includes having larger coasters as well. Uni shouldn't be run by new family rides and old thrilling coasters, ther should be a variety of different rides.