First, it's an omnimax setup. Transitioning from that is a huge headache. While it wouldn't be necessary to reshoot, it would at the very least need to be remastered from the original film/11k DI. Soarin' does have a few unique traits in its film [48fps and being omnimax] that complicate matters. That said, IMAX has started to shift over to newer 4k digital projectors and imax 3d cameras, but I haven't seen any omnimax setups going that way yet [doesn't mean they haven't mind you

].