Most guests show up at the theme parks with little clue what IPs they showcase unless it's one of those rare IPs that drives the market. I've visited the Orlando parks many times with people that are absolutely clueless what IPs are inside until they get a map in the park.
And there's very few of those IPs that breakthrough and drive attendance.
At the 4th gate, the market driving IPs will be Super Nintendo World and LOTR.
Everything else is there to complement those.
Theme parks are like basketball teams. You have superstars (IPs that shift attendance) and role players (IPs that people will enjoy when they're already in the park).
Before Harry Potter, Universal mostly had role player types of IPs. IPs like Jurassic, Mummy, Kong, MIB, Simpsons, etc. (i.e. well-known movie/tv IPs) are great at entertaining people after they get in the parks.
Even among superstar IPs, there are different tiers, so I'd list as follows:
True Superstars: these will shift attendance by the millions, i.e. park headliners:
Harry Potter, Star Wars, Super Nintendo World - Mario
Next level of Superstars: these will shift attendance but not by as much as first group: LOTR, Pokemon, Star Trek, Marvel/DC
Roleplayers: great at entertaining guests when they're in the parks already: Jurassic, Zelda, Toy Story Land, Frozen, MIB, Mummy, Simpsons, etc.