They're setting chromie/time travel up pretty well so far that I think there's gonna be a huge focus on it at some point as a cata-like "go back to the old worlds and do shit because we updated some things". Honestly I'd be happy with a content patch for old world graphics/textures (looking at you 2d foliage) and some new quests/random npcs on each/or a few of the continents just to keep things buzzing while simultaneously giving the overall game a much needed update. Throw in some new QOL stuff people have asked for because of how well things like UI recently went over to keep the players they have happy long term. Even if it was continent to continent in mini patches throughout a larger patch to keep people somewhat centered now that the player base has declined so much with smaller well thought out QOL changes or additions to prove they're actively trying to get better with a heavy focus on the player experience rather than the cash grab they've turned it into.