I think the questions have been answered but just to add to these couple
There really are not any at this point. Arguably player preference for new lands (read islands) until the whole ocean might as well be a serious of straights and channels that we never thought of mapping out before or cosmic plane hopping until we go super cosmic.
Even then, the only argument I see is that we “lose” the stories of the past in game. Which sure, that is what happened when Cata was released. We lost all opportunity to experience Classic wow until Classic came out, or you private server’d it. However with Chromie time or some carefully placed Bronze Dragons, that is not an issue. Just a matter of putting in the work.
As Vale mentioned, North Kalimdor needs it. While I agree, I want to pitch the case for Central/Southern Kalimdor.
As a an aside/starting point, every zone redone should be doubled in physical size. Make them truly feel like large and detailed spaces, of course with the added content to fill this new space.
Thousand Needles/Feralas and below have been the long neglected zones of WoW and only received sparing updates with questlines that were often fractured or simply not interesting to a large amount of players. As I fleshed out ideas, I started noticing a trend that southern Kalimdor is a ripe for Reliquary and Explorer’s League expansion and story, with relevant friends. So, it became the theme that southern Kalimdor is archeology themed.
Feralas, arguably being the best of the lot up there with Uldum, could use a huge update and has so much room for growth. Diremaul is an uptapped potential that I’d love to either see the Night Elves start to reclaim, or the Nightborne seek to call their own as a center of arcane study and training in the heart of Kalimdor. The tauren refugee crisis from Thousand Needles needs to be settled and there is so much that can be done with Feathermoon Stronghold.
Speaking of Thousand Needles, what a fun concept with what they ran with as far as story went with a fully flooded zone, but the layout and and design really flopped. Im not wholly sure on how to fix that, as just undoing the flood seems like a odd direction to go. Opening more area to quest, making some larger islands to hop around, might be a direction.
Then we get to the really abandoned zones, Tanaris, Ungoro, and Silithus. There is just no story here outside of some one offs. They are disconnected and really seem like an afterthought.
Tanaris has great troll opportunity as Darkspear and Zandalari attempt to bring them into the Horde/Zandalari fold, or at least making them increasingly less antagonistic to Horde interests. The Reliquary is down south fighting the Explorer’s League but little came of that, so there is room to grow. Gadgetzan is unimpressive and boring that could use a huge make over have it appear similar to its Hearthstone representation, and the pirates off the coast need to be more… piratey. It can still be a hodgepodge of things, but they need to be better fleshed out and updated.
Ungoro has story, it has a lot of titan things, and dinosaurs, and fun, but again it seems so disconnected and presented as an afterthought. Im not too sure what to do with it, but where there are dinosaurs there are Zandalari, so throw a few of them down there with the Reliquary to do dinosaur titan things. For the Alliance… more of Brann?
Silithus becomes the most frustrating because it did receive an “update” and story. By update, we all know a big sword stuck in the middle and now an otherwise unusable zone except to run AQ for transmog and do BFA things. I dont really know what to do with it. Blizzard really said ‘F this zone in particular, its boring as sin’ and stabbed it dead. IDK, chip away the sword and dump its remains in Thousand Needles? Make the deep inland harbor less? Turn it into a salt lake by having the sword damn up the coast? IDK. Stupid choices lead to stupid solutions, though Im not sure many of us would actually be upset if they just poof’d it over there/away. I would 100% bring the Cenarian Circle/Hold back to the area.
Uldum, the other well developed zone and most recently updated, could use new story revolving around the Tol’vir securing their home further and taking up their roles as protectors of their titan facilities. More Reliquary, more Explorer’s League, more Harrison Jones, a true WoW intro to Reno Jackson, Sir Finley, and crew. Have the Earthen Ring show up and give them a little town/outpost down south by Skywall.
The big addition should be turning AQ, given the raid is actually in world, into an actual questing area/zone. Same can be said for ZG, ZA, and ZF. Tolvir in some sections, Magni and company in other sections, Reliquary and Explorer’s Leagues in others, all there to lockdown, study, and secure the area from any Old God shenanigans.
Thats really about it. A starting point for at least a mildly more cohesive southern Kalimdor
I purposefully did the whole thing on my Defias character just to see it burn in perpetuity