My non technical answer is two of my friends have visited USJ and cant stress how much simple fun the ride was and how they wish it was in orlando, and doesn’t look to pricy to make for the amount of awesome it is
Also always wanted to ride it and fits the hub’s theming. Slight storyline change to fit the US market better sounds awesome!
Also isn’t the year round thing due to modifications (for Uni Cool Japan versions of the ride and in the case of hhn season, Space Fantasy: Black hole?)