yeah i just mentioned azshara and cosmic bullshit in my list, so it all ends confirming my point on we don't have much loose ends big enough to make an entire expansions out of it
Nathanos is in the maw and sylvanus will be searching for him until 13.0 or something.
We have more hints towards dragons than that, just saying.The biggest hint is the datamined emerald drake. And yes, that could point towards dragons. Buuut it could also point towards to the Emerald Dragons and by extension Elune. She's been getting more and more involved since....well, Legion, really. And it does make you think that 9.2.5 has Tirisfall restored, but nothing yet, for Darnassus. The future of the Night Elves might be something that will be explored in 10.0. Aaaand also since she IS a former Night Elf, two birds could be killed with one stone and have Azshara show up in the Elune pack.
Yes, it could be elune and more elf bullshit, but this doesn't have enough juice to fill up an expansion, more likely this would be explored in a sidequest about the green dragonflight in the dragon expansion.
An emerald dream expansion is possible, with elune for sure, but just after shadowlands? i doubt it. it would need one or two expansions before going for another plane/dimension like that.