Well, a lot of IOA's attendance problems stemmed from the confusing marketing around the entire resort as a whole (Universal Escape!) and I don't see them making that mistake again with the new park. Likewise, I think we can expect more hard hitting IP's to be present in the new park. Marvel wasn't the powerhouse when IOA opened that it is today, Seuss appealed to a younger audience, Toon Lagoon isn't exactly home to headlining IP's, and Lost Continent was entirely original... Jurassic Park was the only area that had any real drawing power when the park opened in terms of overall general guest brand recognition and popularity.
I think when we see the next park opened, there will be a far better marketing plan in place, and more current and relatable IP's to pull guests in. I'm willing to bet when it opens, HHN won't be needed to get guests in the gate.