The best and most popular rides a park should add are thrilling yet family friendly coasters like a Mummy or Big Thunder mountain especially if they're highly themed or indoors.A lot of the big coasters at Universal are not family friendly or indoors,having them indoors means they're likely to not be as big or extreme as a Hulk and people will be more willing to ride it,having them highly themed just adds to the feeling of the visitor that that's something they have to ride.From the looks of it the Gringotts coaster being built at Universal will fit that bill,if you put something similar themed to JP at IOA,all I can say is WoW,those are the kind of rides Disney takes 20 years to build from design to construction and they're likely to become classics,look at Mummy that's clearly one of the best rides at any park,Big Thunder is not as thrilling but the theming puts it even ahead of Mummy in rides that are classic and 90% of the family can ride it.Even simulators like Spider man,a great simulator will start to get old in 10-15 years, a good coaster is a ride you can ride over and over forever and you will never get tired of it.I understand why Transformers is being built as it is a good ride and all they had to do was copy what they did in Hollywood, but it's too similar to Spider man and is another simulator which like I said,are good but their life span is not as long as a coaster and Universal has way too many of them,building two family friendly but thrilling coasters would be very smart of Universal to get away from all the simulator technology.There's also the rumor of the King Kong 3-D ride coming to JP that's part of the tram tour in Hollywood and looks really cool,but like I said Universal just needs to lay off the simulators and look into highly themed,family friendly dark ride coaster blends for future Universal rides.