Honestly I think making Zul’Aman and Zul’Gurub dungeons instead of raids, was a big huge mistake on Blizzard’s part.
I mean they were troll cities that were literally infused with the power of their gods. If a raid on one of the Alliance or Horde cities was a 5 man dungeon, people would be raging.
ZA - A kingdom the elves of Quel’Thalas had issues with for many years, and had massive colossal wars with: "Oh yeahnah just send 5 people. She’ll be right mate."
ZG - Another kingdom that wrought troubles all over Stranglethorn and was once pinnacle of the southern Eastern Kingdoms - "Oi bro, that army we had to send before was just rubbish. 5 people ought to do it good."
I’d like if they also revealed only certain handfuls of Loa & Wild Gods go to Ardenweald when they die, as some have their own realms of afterlife - whether for better or worse of those they choose to bring there.
Additionally on the Trolls subject, there’s a few storylines Blizz could roll with to impliment friendly factions from the not-so-friendlies or even bring into the fold long lost tribes with dark stories. For instance:
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Drakkari Tribe: A pocket faction of the Drakkari Tribe that hid & protected both the major Loa that survived (From Quests in Zul’Drak), and other Loa not as revered.
. . . . . . . . - Shadowtooth Clan: A sum of survivors from the Shadowtooth Clan from Hyjal, that the initial large story was they were wiped out by the Twilight’s Hammer, but having a sinister truth that the story was only a piece of their story – And the Night Elves by Tyrande’s orders took advantage of the situation, ordering a rain of fiery arrows to be sent down upon their village along with the Twilight’s Hammer ‘Two birds with one stone’ towards her declaration of “Removing Troll filth from Kal’dorei land!”.
With the Zandalari now on the Horde, the Horde could also have a ‘Council of Trolls’ unifying various named empires under the banner to make roleplaying X forest Troll race - canon. Much like the dwarves can do in the Alliance with their clans (eg. Wildhammer).
They could do a thing with various pocket factions being cut out from larger groups, with seperate ideals but same revered culture (Whether it be Loa, Wild Gods, or otherwise) – Much like Darkspear (They were originally part of the Gububashi Tribe), then have the masses that remain potentially unify (Not with the Horde) as an enemy once again ready for a beatdown.
Personally though I’d like an expansion where multiple threats come at the same time - Not a cosmic-threat, but still a dire-force not to be left unchecked / potentially dangers that could over-run the cities if left to their own devices - somewhat like it was in Classic.
Such a concept could be such as Centuar armies amassing and taking over many lands & settlements with the aid of the Botani, whilst the Quillbore are contemplating joining them with their great numbers causing issues, have large unified masses of the not-so-friendly-trolls in both continents, Scourge on loose in the Eastern Kingdoms seeking to reclaim ‘lost lands’ (Lets say Eastern & Western Plaguelands are now renamed Eastern & Western Lordaeron) and have a ‘Rising Legion’ (Remains of the Burning Legion that seek to rise to their former glory) all arising at once in separate armies around Azeroth – Causing mass panic & dire threats.
I feel such an expansion would be a good opportunity to revisit expanding & imprinting the denizens of Azeroth’s cultures and people, whether it be Troll, Dwarves, Draenie and Blood Elves.