I would argue that the castle at the end of Main Street works because the MK is a park with many diverse lands that are all connected by a fantastical castle. HS, for the most part, is less about fantasy and more about, as the current name suggests, Hollywood. If TDO is going to somehow keep the Hollywood theme alive even after changing the park's name and adding Star Wars, then an ice castle still seems out of place imo. If they are going to abandon the current attempted theming and make the park's areas less connected with a broader theme (or lack thereof), then the idea of an ice castle at HS will seem less absurd, particularly if they take the word "Hollywood" out of the name. Just my ramblings on the subject