They might be up-gradable, but they might just make a new quest line in general. There will be more advanced jobs besides SMN introduced, and they didn't add in new Relics in XI to accommodate the new job additions, they added in mythics and then empyrean.

The relics are currently the hardest weapons to get, but look how many started popping up shortly after the quest was released, and then how many people started getting more than one after that. I'm looking forward to seeing how they change the quest with the new hamlet. I'm also looking forward to what the new Titan weapons will bring :3