Great Hall, an Everest style coaster, and a Fantastic Beasts/Buckbeak family dark ride would definitely round out Hogsmeade and silence the claims that WWOHP is too geared toward thrill-seekers (the coaster would be 44"-46", less than FJ, while the dark ride would have no height requirement)
I agree that Dragon Challenge/HP 3.0 is the lowest on Uni's concerns. KidZone, LC, TL, Seuss, JP, World Expo, San Francisco, and Production Central could all use either new attractions, plussing, or a replacement/retooling before DC gets removed