Its not as simple as "we've done 3-D, we've done animatronics, we've done this ride system, lets get this thing open in 6 months".
First of all, you need to understand that Transformers is also a second-generation use of Spiderman tech, and yet the first iteration of the ride in Hollywood and Singapore took longer to build than a year. This is because tech development isnt the only thing that takes time in designing a ride. You have to work out a layout, decide what goes where, and make sure everything synchs up. With Transformers, the entire layout of the ride, evacuation plan, wiring, lighting, etc. had all been figured out previously, and the timing of all the movements and effects had already been programmed. That saved a lotttt of time when building the Orlando Transformers, among other things.
Secondly, if theyre going to do Kong right, its got to be themed well. I dont know about you but I dont care to see a big gray box in the middle of Jurassic Park, even though thats pretty much what we got with Transformers. To do this ride correctly, it needs to be sureounded by foliage, have a well-designed showbuilding, and well-developed surrounding architectural elements to make it a true mini-land separated from Jurassic Park. As we saw with Diagon, the details can sometimes be the most time-consuming aspect of a project. I mean look how long it took for all the London facades to go from
big gray boxes to ready-for-opening.
Just because the tech is there doesnt mean the ride will be a breeze. Even in regional amusement parks, an original roller coaster will take longer to build and develop than a clone, even if theyre the same ride type.