None.
They already delayed this 6 months for absolutely no reason. Since its just 1 quest series and the things to do are exactly copypasted from before. We already are reciving 1 dungeon version (a recycled dungeon already) less in exchange of "new diferent content". If they can`t manage, they aren`t doing it right.
Is XIV a big MMORPG? yes. Has enough budget? but of course yes. I expect nothing less than what any other MMORPG might offer. And we are recibing far less, actually, for this questline, we are reciving literally nothing. They delayed this 6 months to give us nothing.
Unrealistic? WoW is making exactly what im proposing. If a big MMORPG like WoW can. A big (and riding the wave!) MMORPG like XIV can. If not, then the title isn`t worth the care of their devs anymore.
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That aside, thats just wishing, it wont happen, in 5 years more people will be grinding fates to get atmas to get their i610 relic.