Pure speculation... but what the heck... with so little details it’s fun for now:
What if the hub/spine serves a dual purpose... park hub during the day, pseudo-Citywalk by night. Each of the world/lands appears to have a choke-point entry/exit that could easily be gated off come typical park close leaving the hub alone open to everyone... and requiring no main gate fee. The few rides in the hub then become a separate pay-per-ride or night ticket. The dueling coaster sure has a high reride factor and the idea is similar to the rumors that once existed for RRR. I imagine a carousel and few other select rides could be the same. Mix in stores and dining in the hub and you have a nighttime complex that extends the options for on-site hotel guests into the evening. Seeing as how Universals trend as of late at Citywalk 1.0 is to reclaim leased space for themselves and develop and operate their own dining/retail concepts, it certainly would not require outside vendors to fill space/ideas.
Now that I could see. Question is, what happens when people attempt to sneak into the surrounding lands?