I think the Orlando family market is largely saturated in its current state. They'll never be able to compete with their competition when their budget is 15-20 mil and Uni & Disney's is 150-200 mil per attraction. But if you think adding more of the same things that can be found at your regional Six Flags or Cedar Fair park is a good idea, well...that's solely your opinion.
SeaWorld needs a differential that not only competes with their big budget neighbors but also is enough to draw folks away from parks like Kings Island/Dominion and Six Flags. Nobody is going to waste a vacation day on duplications of rides that are sitting back at home, 45 mins down the road.
The focus should be on more rides like Manta, Falcons Fury, and Cobras Curse. They're either one-of-a-kind technological marvels or hybrid rides with queue enhancements and in-park integrations. They need to stop producing rides like Mako, Cheetah Hunt, Antarctica, and VR enhancements that are just piled on and are of no value added once their respective honeymoon periods have elapsed. Focus on a unique set of experiences that'll draw people in. But what do I know?