I actually thought Eureka would be that kind of content that would make us grind for things for a bit longer than a week. Like in FF11? There you would of grinded for a long time to get your relic and feel rewarded after that. But sadly... Eureka was created as a mind-numbing "kill X amount of mobs" content and then got changed by the community into the FATE training to make it more endurable.
I believe what we really need is a really long quest chain that rewards us with a good iLVL relic worth the effort and time. But I dont see it coming. Why? Because SE/Devs love to give us small crumbles on each patch. Instead of quests lasting throughout the whole expansion we get "a new step" which is farmed/can be farmed within a week.