First of all I have to say that I do think they are going to make a god expansion gameplay wise ... I do like some of the new features they promised , and I bet they will make the game better.
However , story wise I just don't feel exploring islands in the old world was the best way to go ... In legion they introduced space ships so I just thought it would be better if we explored new worlds, new life and new civilizations. I kinda wanted to baldly go where no troll has gone before ... This would feel way more natural to me.
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I just think they are adding to much stuff on Azeroth map, to the point I can't recognize it any more. And even with spaceships and flying, and constant traveling between Kalindor and Eastern kingdoms we just now found out there are massive islands we never knew about there ... I know this is a game , but I just think that space travel to new worlds would make more sense ...