Someone mentioned that most hot IPs are gone and already have attractions now so what would Uni do for a third park. Well, one property that is most certainly still hot whether anyone wants to admit it or not (and just got another movie green-lit), is Spongebob. I assume Spongebob's presence will be going away once Nintendo opens, but that clears the way to build an entire Bikini Bottom in a third park.
People try to say it isn't a hot franchise, mostly because the show stopped being good a long time ago and most likely the vast majority of us don't watch it. But it's still a HUGE deal with kids and the nostalgia in many young adults would likely peak interest, too.