Just saw a video of one of the FF XIV lore channel, explaining the situation and the potential that Garlemald could be invaded or attack by one of the civilizations that they either conquered or not.

Wuk Lamat mentioned one of her brothers wanted to conquering Garlemald, showing that the civilization and it's people are still in danger because of the deeds they have done. And even if the scions and we, the warriors of light try to stop this, that doesn't mean Wuk Lamat's brother will be the last, since a lot of people would see the Garleans burn.

So i wonder if in Dawntrail and maybe other expansion will show us if this would happen. Since Garlemald is in a weakens sate and the source has suffered 60/70 years under the Galrean's yolk, i wouldn't be surprise if they would attack them out of hatred and demanding justice and revenge of what the Garlemald has done to them.