Something is going to happen after the maintenance. You can lose all the faith in SE that you want, but it's silly to think that they would so thoroughly set up a climactic event and then just do nothing.

Dalamud has been falling for months and now it is about to strike the planet's surface. The Twelve are about to be summoned in a last ditch effort to prevent Dalamud from destroying us all. The Garleans have gathered, and are about to launch a final major assault, and the Grand Companies and adventurers (us) need to hold them back to allow the summoning to happen.

That's where we are right now. I mean, you can look at it however you want, but that isn't an ending. The climax has yet to happen.