I'd love it better if all of the Old Gods except for N'zoth were dead, and stayed dead throughout WoW's history. I don't need them to come back, considering the new lore. Old God's can die, either through getting plucked out, or by dying in the ground. However, their final blows do cause shit. For example, C'thun/Yog'sarron caused Earth Quakes, which fucked the Elements over, hence starting the Cataclysm. And, Y'sharrj was just plucked, though he did cause the Sha, and the Well. Though, the Well was just an After Effect of the plucking.
I also think Alexstrasza won't die, unless they give her a reason to. And, the Infinite Dragonflight may only last this coming Expansion, if we do time it right (In which, we likely will). Oh, and as for the Elemental Lords, I can see them as either Minor Raid Villains (For Example, ToV styled Raid bosses. Meaning, not too effective over the Lore, in a sense), or they can be set as Minor Characters (For Example, Therazane for a few simple quests, and Neptulon with his Naga shit).
However, the main focus will be against Azshara, N'zoth, and the Black Empire.
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Off Topic: I just realized this.
What everyone thinks Before the Storm is about: Some Life is Strange Prequel.
What we think Before the Storm is about: Naga, Old Gods, Chaos, Infinite BS, Void shit, Tentacles, War, Naval War, and...well...Pirates...
Just...just...Pirates.
Mutha fuckin Pirates.