If it goes to 2021, it's for one reason and one reason only. Universal has absolutely nothing else in the pipeline.
Their plan (Which, IMO is a terrible one) is starting to look like:
- Bourne for 2020
- JP for 2021
- Absolutely nothing of substance for 2022
- Fantastic Worlds for 2023 (We hope, it could easily be 2024)
Quite the contrast from 18 months ago when we were real high on what was rumored to be in the pipe. The collapse of the KidZone Redo and SLoP in Shrek's plot really torpedoed our expectations.
Enjoy Hagrid's, as it's going to be amazing and truly special. But after that? I would recommend everyone lower their expectations dramatically and prepare for WDW with everything in their Pipeline + 50th to smack UOR into obscurity until Fantastic Worlds opens.
And because of that, I'd expect management changes in the next 2-3 years; if not sooner.