A statement by Spirit got me thinking "A MAJOR IOA attraction may well be going away. ... "
I wonder if Universal has ever considered replacing River Adventure. The footprint is quite massive: 236,000+ square feet when including the queue, outdoor portion, show building, and overflow pond. Compare that to the size of other major attractions: Gringotts 98,000, Mummy 95,000, Spiderman 86,000, MIB 83,000, ET 65,000, Transformers 41,000.
If the island is rethemed for Jurassic World, this area could be used for several attractions of various sizes. In addition the water/thrill factors of JPRA probably limit it's capacity to be a true people eater, especially during the colder months.