A lot of people blow off time travel, but considering Graha Tia's continued existence, doesn't that mean his timeline is still around? This is is a timeline that gave so much to save our current timeline. If there's literally anything that can be done to help it in some way, then I can see the story heading there for an expansion to help set it on a better path, possibly even getting a "Zodiark Prime" boss fight where we figure out a way to give him a new heart so he could protect that world until they figure out a way to avoid destruction by Meteion.