Maybe you should head down to Busch Gardens Tampa, probably the best coaster park in Florida. Islands of Adventure isn't, and I honestly don't think it should be. The park offers things for most ages, but mainly in the thrill department. If they want to follow what they're adversting, "a family vacation" and be able to compete with Disney, they do not need another big thrill. Adding a new, mega thrill coaster would certainly not be adding variety to a park that already has two B&M inverts and a B&M sit-down coaster.
But hey, it's all a matter of opinion. And I could see why you would (personally) want a big coaster, because they are fun. But realistically, I don't think it's what the park needs. Plus, it would probably look completely unattractive at Islands of Adventure (one of the most immersively themed parks in the world).