I'm a fan of eureka (Working on 3rd weapon), but there needs to be a lot of things added if they want the mass majority to continue on. They need to remove the train and add in things to do outside of killing mobs and NMs. Need more dynamic fates like seiges, camp take overs, escorts. More group oriented content like Leve quests and smaller party locked NMs, Make mobs use mechanics and abilities sooner, make people actually have to move, improve on bunnies, and most importantly anything that's required for the relic make it a reward in everything they add.

My biggest concern with eureka is they'll add one shallow piece of content (Bunny fates) and then revert the content back to favor the train mentally.