Whether you consider Skull Island as a part of Jurassic Park or not, I'd still put my money on them not doing both projects at the same time (finishing the coaster and re-doing JPRA).
Stragegically it would likely make more sense to do one after the other:
- maximize overall attraction capacity. Once Coaster opens it will take the capacity (and then some likely) that JPRA would lose if it shuts down for an extended period.
- Give them another "new" attraction on their calendar in a year there doesn't appear to be one if the plan still is:
- Hagrid's 2019
- Bourne 2020
- JP Coaster 2021
- Nothing major rumored for 2022 other than perhaps a new parade, so put JPRA re-do here
- New Park 2023