I think post-Epic something may be likely. They’re going to be looking for reasons to push people towards USF and IOA (although mainly USF), and a retheme/renovation of an existing attraction would be a far more cost-effective way to do that than a new attraction. A JPRA-redo may be a quick and easy draw for IOA immediately after Epic opens to fill the void before the Lost Continent replacement.
As for theme or scope, I think something akin to what was done with Spidey. The same story is retained, but what worked was heavily refurbished and what no longer worked was replaced with modern technology to achieve the same general effect but better (like the 3D screens for Spidey). I think it wouldn’t be unreasonable for the JP theme to remain. I’ve heard that JW Rebirth is going to liken back to the original Jurassic Park in tone as well as story, opting for the grittier, smaller scale of the first three movies rather than the modern, global scale of the JW trilogy.
If the franchise continues to liken back to the original movie, it would make sense for its theme park representation to be the very thing that everything else seems to be drawing from.
If it were up to me, (blue sky incoming) replace the ultrasaur with a film accurate Brachiosaurus, refurbish the Stegosaurs, replace the Hadrosaur with a more reliable animatronic that will actually appear on the ride for more than a week at a time, add a crashed Ford explorer by the raptor cage, move the Dilos to the bottom of the lift hill (there’s a dead spot here almost like in the 2019 version of Hollywood’s redo) replace the raptors with film-accurate models that aren’t put to shame by the Velocicoaster versions, add the Hollywood T-Rex head from the ceiling where the Dilos were (very cool effect), and renovate Rexy to move and look like her Japanese counterpart (Lately our Rexy looks like a statue with a slowly moving head where the Japanese Rexy actually looks like a real Dinosaur).
These changes alongside a new soundtrack and script would be a cost-effective way to market a NEW AND IMPROVED ATTRACTION for IOA before they finally put Lost Continent under the knife. If they won’t replace Lost Continent until 2028-2030, doing this in late 2025 or the first part of 2026 would give the park a quick and easy draw for guests.