Speaking of the new eureka

Make every new zone an eureka zone in the next expansion
Start relics from the beginning of the new expansion; you get a basic relic at the beginning of the 6.0 msq which you level up in the same way you level them up in an eureka zone.

Why make separate eureka zones when you can just use the 6 expansion zones for it?
The 6 zones are only used for msq and gathering; as we've seen...with TRUSTS and dungeons being a better leveling option, the open world is irrelevant to the game. Give it some relevance by making them relic zones.