For now, yeah. We still have Ny'alotha to go to, the Dragon Isles, as well as the whole Death/Elune thing to go through. Pretty sure 9.0 is going to solve the rest of the plots still going around on Azeroth. 10.0 might be where we do the whole Void Lords BS. Remember, the Legion, and the Black Empire were dealt with in the span of 1 Expansion. So, I mean...
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9.0 will most definitely be about Death. They're going to save the Void Lords for last. They're literally the Outer Gods of WoW.