So here's an idea! Not even that an original of an idea.. but an idea nonetheless.
Yoshi-P already confirmed relics will be upgradeable at some point in time.
Wouldn't it be kinda cool if the upgrades worked on sort of a weapon tree system.
Say for example, your Gae Bolg could be upgraded to either a Gugnir or a Zodiac Spear, each of the different options focusing on specific stats (ie. crit attack vs something whatever)
Of course, this isn't an entirely new concept (shout out to monster hunter) but it could be fun for XIV relics.
Discuss, expand, flame on!