I'd honestly love if they did something that merges the old Universal Experience concept with what people like about the tribute stores -- that is, a walk-through museum, of sorts, where each room is heavily and uniquely themed to one of their IPs. Have a room themed to Doc Brown's house or Institute of Future Technology for BTTF; have another room be a forest themed to ET; another room with an Amity theme for Jaws; a Whoville room for the Grinch; a number of opportunities for Universal Monsters or even Chucky... and so on. Each room could be filled with props on display that are otherwise collecting dust somewhere, and photo op opportunities with preserved puppets/animatronics or backdrops/figures, whatever. There's so much history to be mined that's just sitting in a warehouse, and even though "having rides" is the best option, I'd rather have an immersive stroll through their franchises over nothing at all.