Were all our efforts wasted? *spoilers*

[Delsus]

From a lore standpoint, it was bound to happen since Eorzea goes through Umbral/Astral eras. But I wouldn't say there was no point to it. Grand Companies were revived and the Eorzeans came together thus making the coming Astral era start on a right foot.

It wasn't supposed to happen at all, the 6th astral era (before Dalamud's fall) was supposed to be the end of the cycle, however the Garleans brought the 7th umbral era, the 6th astral era was supposed to be a time of eternal peace.