I think it will take some time until Squeenix will adress the rebuilt of Garlemald (remember that it took for Ishgard restoration works 2 Expansions of time in order to be a thing), since they have probably their hands full currently with alot of projects and Yoshi P. haunting the JP Datacenters for Crystal Conflict Ranked Matches (currently in Gold 1 as BLM, last time i checked).

So there is little point in (Garle-)malding about the matter. Chances are good that it will happen since Squeenix usually does Restoration Works in a new instances area, and since the inner City, as well as the Palace itself, is part of the background of the Garlemald area we have access to, it doesnt seem so farfetched that it will happen sooner or later.