The two things I would like to discuss are the map and elytras.
Map: Next rev, if the mod is not updated, it would be best to go to vanilla. Although, it seems like, and Mojang has said, it will most likely be releasing this summer. If it's released in the summer, the mod should be updated if the developer is active in updating the mods. It will take a lot of effort to update, but by the pre-releases, it could be out next month, allowing 2 month development on the mod. Should be plenty of time.
Elytras: Please revert to the old methods of getting elytra and the original dragon fight. With the new Phantom membrane being released, doing this would ruin elytras. The phantoms alone would be hard enough (chaos experience.) to fight for enough membrane to repair. Roads and rails are created anyways because if your elytra breaks, you need roads/rails to find a grinder safely.