I could be wrong, but I don’t believe JPRA will ever be re-themed from the original movie. Universal Creative right now seems to realize how powerful evergreen nostalgic movies like all the Spielberg stuff, Ghostbusters, BTTF, Monsters etc is. They’re getting big park presence with as much merch, event representation etc as their modern films.
With Velocicoaster next door as a world class coaster and must-do attraction representing the World films, I see little reason to retheme JPRA and the overall area to a 10 year old reboot that was only mildly well received and doesn’t seem to have much of a legacy.
If they HAVE to retheme it, I wouldn’t hate Rebirth as long as the overall land stays Park themed. But idk, I think a massive refresh keeping everything the same is the most likely outcome