Vast majority of people are fine with Legion and I really don't see why they're suddenly interested in Classic. Some are open in their ideas that they don't really want classic and want a "pristine" server so they're pushing hard to shape classic into one. And this is understandable as the vast majority won't play the classic WoW nowadays, the same way the vast majority won't play Arcanum or Wizardry 8. So now it remains to be seen if blizzard caves in once more or it sticks to the actual vanilla and the questions is only in the version of vanilla.