So:
1. Do you think this will actually happen? When? how?
2. What do you think it will look like?
3. Where do you think it will happen?
4. Why should it really happen?
My Answers:
1. Yes it will happen - because you've moaned too much about it:
a) It will happen when they do a world revamp
b) It will happen using existing assets polished and repurposed
2. It will look like a cross between Suramar and Zin'Azshari in warbringers, and Nar'thalas in Azsuna. It will have Zin'Azshari colours and not Suramar colours. It would be surrounded by nature and have lots of gardens.
3. It will happen on Hyjal, the broken isles is gone to the horde - hyjal has both Nordrassil and the Well of Eternity, and the night elves are now sufficeintly weak and battered enough for these racial assets previously nuorishing the world to also now work to their restoration.
4. It should happen because people care about races, and because night elves are very popular, if one of your most popular races is decimated by you in your story, and you receive a lot of fan hate for it, you'd be stupid to leave it just like that.
I don't think senior devs particularly care for night elves, and of those that still work at blizzard now, it's hard to say, but a lot of love was put into Suramar, night elf lore, so there must be junior designers that love the essence.
The new night elf home will be incredible: It will boast of the best of all areas of the kaldorei.
- City structures and wonders would be attributed to the shen'dralar's great skill as the kaldorei empires main magic wonder workers and engineers /architects
- Hyjal's natural beauty and deep forest lore of the wild gods will inform the state of nature as it is rebuilt. The city would likely be in the charred vale from the firelands incursions, but the rest of Hyjal would be beautiful forests, gardens leading up to the Well of Eternity and the World tree.
- A new Cathedral of Elune would be the centre piece of the new city and likely be clean version of the ToS in the broken isles, with bourrowed assets
- One day the barrowdnes and under mountain regions of Hyjal will open up, it is likely here the demon hunters will work together
We are likely never really going to go back to the Broken Isles for anything, it failed as a viable option when blizzard changed the Nightborne to horde. Allied races are very unlikely to get any real focus , Nightbonre are at a disadvantage uncoupled from the night elves - beacuse of their identity, it works better to be Silvermoon focused. But the future of the nightborne and blood elves depends on how heavy a role the alliance elves will have to play with Quel'thalas.