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Whenever a Remake happens, I can see them adding stuff they weren’t able to put in before. Even stuff from Dark Dawn into the original. There’s a lot they could do. The question is, will they?
I would believe they would if they intend to start making remakes. The thing is they have tons they can work with for the remakes.
According to the Camelot Software Planning Wikipedia page they have 44 people, but still have key component players in the Golden Sun making group.
en.wikipedia.org
Working on the Mario Sports title has prepared the team for working on HD games. Plus they can pull resources from Monolithsoft support team to help make games.
If they remake the Golden Sun games I can see them adding Beastmen and Belinski mentions alongside merging both The Broken Seal and The Lost Age.
Golden Sun Dark Dawn could be remade with more quality of life improvements like allowing backtracking to previous areas and to expand more on the story while leaving the cliff hanger.
The Fourth Golden Sun game (Solar Eclipse) would focus on what happened to Rief's sibling and what she was up to, which would be perfect to introduce a new team and the rest of Weyward we never got to see in Dark Dawn.
The Fifth Golden Sun game (The Lunar Colony) would focus on the other type of adepts that Alex mentioned at the end of Dark Dawn and would explain where the Wise One came from.
The Sixth Golden Sun game (The Wise One) could have all the parents and the children team up to fight against Alex and his forces leaving for one final battle for the future of Alchemy and its uses.
There is plenty they can pull from for more games, it is all according to whether Nintendo gives the go ahead for Remakes.